Marine Tech Grade Plywood

[Tristan]

Anyone use if in boat building? Looks like it ought to be OK save the faces are only BB or B,C (with knots filled). 3/8 has four plys I believe. Any info welcome.

[Tristan]

Anyone use if in boat building? Looks like it ought to be OK save the faces are only BB or B,C (with knots filled). 3/8 has four plys I believe. Any info welcome.

[Tristan]

Anyone use if in boat building? Looks like it ought to be OK save the faces are only BB or B,C (with knots filled). 3/8 has four plys I believe. Any info welcome.

[kc8pql]

Originally posted by Tristan:
3/8 has four plys I believe. Plywood should have an uneven number of plys for stability. 3/8" marine grade should have 5 or even 7 plys.

[kc8pql]

Originally posted by Tristan:
3/8 has four plys I believe. Plywood should have an uneven number of plys for stability. 3/8" marine grade should have 5 or even 7 plys.

[kc8pql]

Originally posted by Tristan:
3/8 has four plys I believe. Plywood should have an uneven number of plys for stability. 3/8" marine grade should have 5 or even 7 plys.

[Bruce Hooke]

I've never heard of the stuff, but the face grades sure don't sound promising!

[Bruce Hooke]

I've never heard of the stuff, but the face grades sure don't sound promising!

[Bruce Hooke]

I've never heard of the stuff, but the face grades sure don't sound promising!

[Gary E]

Since most of youse guys cover whatever you use with FIBERGLASS anyway... whutz the big deal?

[Gary E]

Since most of youse guys cover whatever you use with FIBERGLASS anyway... whutz the big deal?

[Gary E]

Since most of youse guys cover whatever you use with FIBERGLASS anyway... whutz the big deal?

[John Teetsel]

More info please.

How big is the boat?
Used for hull, bulkhead, what?
What finish - glass or just paint?
Sail or motor?
Open ocean or protected waters?

BB and BC!
How much are you REALLY going to save in $$?
In time?
In worry?

[John Teetsel]

More info please.

How big is the boat?
Used for hull, bulkhead, what?
What finish - glass or just paint?
Sail or motor?
Open ocean or protected waters?

BB and BC!
How much are you REALLY going to save in $$?
In time?
In worry?

[John Teetsel]

More info please.

How big is the boat?
Used for hull, bulkhead, what?
What finish - glass or just paint?
Sail or motor?
Open ocean or protected waters?

BB and BC!
How much are you REALLY going to save in $$?
In time?
In worry?

[Tristan]

Originally posted by John Teetsel:
More info please.

How big is the boat?
Used for hull, bulkhead, what?
What finish - glass or just paint?
Sail or motor?
Open ocean or protected waters?

BB and BC!
How much are you REALLY going to save in $$?
In time?
In worry?Hi John, Thanks for your reply. It's a question of what's available locally, costs pretty near the same as Marine, which I find impossible to obtain around Naples. I've used it in building an 8 foot pram, it's clear of voids, seems to be glued with the same glue as marine. Currently I need a couple pieces of quarter inch for the cabin top of a 16 foot Bahama Sharpshooter (sailboat for use inshore). iT will be covered outside with polypropylene cloth and 1 to 1 epoxy resin. I've used it in building a 15 foot Diablo about four years ago, no problems to date. I am just curious what the wood mavens know about Marine technical grade and haven't been able to find anything much about it using Google. I'm also contemplating building an Alaskan skiff (18 foot version) and would use it unless I can find a local source of Marine (which I've not yet done). Thanks again.

[Tristan]

Originally posted by John Teetsel:
More info please.

How big is the boat?
Used for hull, bulkhead, what?
What finish - glass or just paint?
Sail or motor?
Open ocean or protected waters?

BB and BC!
How much are you REALLY going to save in $$?
In time?
In worry?Hi John, Thanks for your reply. It's a question of what's available locally, costs pretty near the same as Marine, which I find impossible to obtain around Naples. I've used it in building an 8 foot pram, it's clear of voids, seems to be glued with the same glue as marine. Currently I need a couple pieces of quarter inch for the cabin top of a 16 foot Bahama Sharpshooter (sailboat for use inshore). iT will be covered outside with polypropylene cloth and 1 to 1 epoxy resin. I've used it in building a 15 foot Diablo about four years ago, no problems to date. I am just curious what the wood mavens know about Marine technical grade and haven't been able to find anything much about it using Google. I'm also contemplating building an Alaskan skiff (18 foot version) and would use it unless I can find a local source of Marine (which I've not yet done). Thanks again.

[Tristan]

Originally posted by John Teetsel:
More info please.

How big is the boat?
Used for hull, bulkhead, what?
What finish - glass or just paint?
Sail or motor?
Open ocean or protected waters?

BB and BC!
How much are you REALLY going to save in $$?
In time?
In worry?Hi John, Thanks for your reply. It's a question of what's available locally, costs pretty near the same as Marine, which I find impossible to obtain around Naples. I've used it in building an 8 foot pram, it's clear of voids, seems to be glued with the same glue as marine. Currently I need a couple pieces of quarter inch for the cabin top of a 16 foot Bahama Sharpshooter (sailboat for use inshore). iT will be covered outside with polypropylene cloth and 1 to 1 epoxy resin. I've used it in building a 15 foot Diablo about four years ago, no problems to date. I am just curious what the wood mavens know about Marine technical grade and haven't been able to find anything much about it using Google. I'm also contemplating building an Alaskan skiff (18 foot version) and would use it unless I can find a local source of Marine (which I've not yet done). Thanks again.

[Bruce Hooke]

Originally posted by Gary E:
Since most of youse guys cover whatever you use with FIBERGLASS anyway... whutz the big deal?Voids in plywood, even if that plywood is covered with epoxy and fiberglass can cause a couple of problems. First off, if there are large voids the plywood may not bend into a fair curve. Second, voids contain air, which under the right circumstances can condense moisture, which can lead to rot from the inside out.

[Bruce Hooke]

Originally posted by Gary E:
Since most of youse guys cover whatever you use with FIBERGLASS anyway... whutz the big deal?Voids in plywood, even if that plywood is covered with epoxy and fiberglass can cause a couple of problems. First off, if there are large voids the plywood may not bend into a fair curve. Second, voids contain air, which under the right circumstances can condense moisture, which can lead to rot from the inside out.

[Bruce Hooke]

Originally posted by Gary E:
Since most of youse guys cover whatever you use with FIBERGLASS anyway... whutz the big deal?Voids in plywood, even if that plywood is covered with epoxy and fiberglass can cause a couple of problems. First off, if there are large voids the plywood may not bend into a fair curve. Second, voids contain air, which under the right circumstances can condense moisture, which can lead to rot from the inside out.

[John Teetsel]

Tristan, I found this at Glen-L:
"A material that does not qualify as a "marine" plywood under APBA specifications, but that is manufactured for marine use."

http://www.glen-l.com/wood-plywood/marine-tech.html

Sounds like it will be fine.
See if you can track down some MDO, medium density overlay for the Alaskan skiff.
Next to peel ply, it's the best kept secret in boat building. ;)

Characteristics: An EXTERIOR type plywood with a weather-resistant resin overlay bonded to the wood by heat and pressure. This process fuses the molecules of the overlay with the fibres of the wood to form a bond as strong as the wood itself. MDO has all the advantages of regular plywood as well as additional properties. The overlay, which has 28% resin content, resists water, weather, wear and degradation. It has texture that paint can grip with remarkable tenacity. Paint finishes on MDO are up to three times more durable than the same finish applied to ordinary plywood.

[John Teetsel]

Tristan, I found this at Glen-L:
"A material that does not qualify as a "marine" plywood under APBA specifications, but that is manufactured for marine use."

http://www.glen-l.com/wood-plywood/marine-tech.html

Sounds like it will be fine.
See if you can track down some MDO, medium density overlay for the Alaskan skiff.
Next to peel ply, it's the best kept secret in boat building. ;)

Characteristics: An EXTERIOR type plywood with a weather-resistant resin overlay bonded to the wood by heat and pressure. This process fuses the molecules of the overlay with the fibres of the wood to form a bond as strong as the wood itself. MDO has all the advantages of regular plywood as well as additional properties. The overlay, which has 28% resin content, resists water, weather, wear and degradation. It has texture that paint can grip with remarkable tenacity. Paint finishes on MDO are up to three times more durable than the same finish applied to ordinary plywood.

[John Teetsel]

Tristan, I found this at Glen-L:
"A material that does not qualify as a "marine" plywood under APBA specifications, but that is manufactured for marine use."

http://www.glen-l.com/wood-plywood/marine-tech.html

Sounds like it will be fine.
See if you can track down some MDO, medium density overlay for the Alaskan skiff.
Next to peel ply, it's the best kept secret in boat building. ;)

Characteristics: An EXTERIOR type plywood with a weather-resistant resin overlay bonded to the wood by heat and pressure. This process fuses the molecules of the overlay with the fibres of the wood to form a bond as strong as the wood itself. MDO has all the advantages of regular plywood as well as additional properties. The overlay, which has 28% resin content, resists water, weather, wear and degradation. It has texture that paint can grip with remarkable tenacity. Paint finishes on MDO are up to three times more durable than the same finish applied to ordinary plywood.

[pipefitter]

I tried some of the 4 ply marine tech ply in 3/8ths. It was like a potato chip when it was new and finishes badly. For the money I saved over the meranti,I made up for it in epoxy and fibreglass and sanding time. Never again. Don't dare sand it anywhere because it will take about 5 coats of epoxy to bring the surface level enough for fairing.So now it has become 1/2" plywood.Did I mention sanding time? Sandpaper is expensive.

[pipefitter]

I tried some of the 4 ply marine tech ply in 3/8ths. It was like a potato chip when it was new and finishes badly. For the money I saved over the meranti,I made up for it in epoxy and fibreglass and sanding time. Never again. Don't dare sand it anywhere because it will take about 5 coats of epoxy to bring the surface level enough for fairing.So now it has become 1/2" plywood.Did I mention sanding time? Sandpaper is expensive.

[pipefitter]

I tried some of the 4 ply marine tech ply in 3/8ths. It was like a potato chip when it was new and finishes badly. For the money I saved over the meranti,I made up for it in epoxy and fibreglass and sanding time. Never again. Don't dare sand it anywhere because it will take about 5 coats of epoxy to bring the surface level enough for fairing.So now it has become 1/2" plywood.Did I mention sanding time? Sandpaper is expensive.

[Tristan]

Thanks John, MDO sounds interesting. Will look around but it's hard to locate anything but the roughest grades of plywoods (used for roofing) here in Naples. I too found the Glen-L reference but am (still) hoping for further info, for example someone who swears by Marine Technical and wouldn't use anything else. :D :D Anyhow, thanks again for the info.

[ 03-29-2006, 12:27 PM: Message edited by: Tristan ]

[Tristan]

Thanks John, MDO sounds interesting. Will look around but it's hard to locate anything but the roughest grades of plywoods (used for roofing) here in Naples. I too found the Glen-L reference but am (still) hoping for further info, for example someone who swears by Marine Technical and wouldn't use anything else. :D :D Anyhow, thanks again for the info.

[ 03-29-2006, 12:27 PM: Message edited by: Tristan ]

[Tristan]

Thanks John, MDO sounds interesting. Will look around but it's hard to locate anything but the roughest grades of plywoods (used for roofing) here in Naples. I too found the Glen-L reference but am (still) hoping for further info, for example someone who swears by Marine Technical and wouldn't use anything else. :D :D Anyhow, thanks again for the info.

[ 03-29-2006, 12:27 PM: Message edited by: Tristan ]

[Tristan]

Originally posted by pipefitter:
I tried some of the 4 ply marine tech ply in 3/8ths. It was like a potato chip when it was new and finishes badly. For the money I saved over the meranti,I made up for it in epoxy and fibreglass and sanding time. Never again. Don't dare sand it anywhere because it will take about 5 coats of epoxy to bring the surface level enough for fairing.So now it has become 1/2" plywood.Did I mention sanding time? Sandpaper is expensive.Good info, thanks. I have used it, and have had to fill and sand a bit, but I suspect my boats are a bit rougher than some. (hell, I KNOW they are!)

[ 03-29-2006, 12:29 PM: Message edited by: Tristan ]

[Tristan]

Originally posted by pipefitter:
I tried some of the 4 ply marine tech ply in 3/8ths. It was like a potato chip when it was new and finishes badly. For the money I saved over the meranti,I made up for it in epoxy and fibreglass and sanding time. Never again. Don't dare sand it anywhere because it will take about 5 coats of epoxy to bring the surface level enough for fairing.So now it has become 1/2" plywood.Did I mention sanding time? Sandpaper is expensive.Good info, thanks. I have used it, and have had to fill and sand a bit, but I suspect my boats are a bit rougher than some. (hell, I KNOW they are!)

[ 03-29-2006, 12:29 PM: Message edited by: Tristan ]

[Tristan]

Originally posted by pipefitter:
I tried some of the 4 ply marine tech ply in 3/8ths. It was like a potato chip when it was new and finishes badly. For the money I saved over the meranti,I made up for it in epoxy and fibreglass and sanding time. Never again. Don't dare sand it anywhere because it will take about 5 coats of epoxy to bring the surface level enough for fairing.So now it has become 1/2" plywood.Did I mention sanding time? Sandpaper is expensive.Good info, thanks. I have used it, and have had to fill and sand a bit, but I suspect my boats are a bit rougher than some. (hell, I KNOW they are!)

[ 03-29-2006, 12:29 PM: Message edited by: Tristan ]

[RichKrough]

I have 8 sheets of 1/4" and 1 sheet of 3/8's Marine Tech I picked up cheap(waterstained) at my local lumber yard last fall. I am building a 16' skiff from it in a couple of weeks. It won't win you any beauty contests nor become heirloom. But for a in-shore fishing or utility boat knockabout I think it will work fine.

[RichKrough]

I have 8 sheets of 1/4" and 1 sheet of 3/8's Marine Tech I picked up cheap(waterstained) at my local lumber yard last fall. I am building a 16' skiff from it in a couple of weeks. It won't win you any beauty contests nor become heirloom. But for a in-shore fishing or utility boat knockabout I think it will work fine.

[RichKrough]

I have 8 sheets of 1/4" and 1 sheet of 3/8's Marine Tech I picked up cheap(waterstained) at my local lumber yard last fall. I am building a 16' skiff from it in a couple of weeks. It won't win you any beauty contests nor become heirloom. But for a in-shore fishing or utility boat knockabout I think it will work fine.

[Tristan]

Originally posted by RichKrough:
I have 8 sheets of 1/4" and 1 sheet of 3/8's Marine Tech I picked up cheap(waterstained) at my local lumber yard last fall. I am building a 16' skiff from it in a couple of weeks. It won't win you any beauty contests nor become heirloom. But for a in-shore fishing or utility boat knockabout I think it will work fine.Thanks Rick, It's held up fine in my Diablo also. When I first bought some I examined it pretty carefully and it appeared to me that it was pretty much like regular marine but without the great (usually) surfaces. I'll have to check the number of plys in the 3/8 and 1/2 that I have. I know the 3/8 has more than interior fir and I guess it would have to be 5, as four wouldn't make sense in terms of alternating plys.

[ 03-29-2006, 02:28 PM: Message edited by: Tristan ]

[Tristan]

Originally posted by RichKrough:
I have 8 sheets of 1/4" and 1 sheet of 3/8's Marine Tech I picked up cheap(waterstained) at my local lumber yard last fall. I am building a 16' skiff from it in a couple of weeks. It won't win you any beauty contests nor become heirloom. But for a in-shore fishing or utility boat knockabout I think it will work fine.Thanks Rick, It's held up fine in my Diablo also. When I first bought some I examined it pretty carefully and it appeared to me that it was pretty much like regular marine but without the great (usually) surfaces. I'll have to check the number of plys in the 3/8 and 1/2 that I have. I know the 3/8 has more than interior fir and I guess it would have to be 5, as four wouldn't make sense in terms of alternating plys.

[ 03-29-2006, 02:28 PM: Message edited by: Tristan ]

[Tristan]

Originally posted by RichKrough:
I have 8 sheets of 1/4" and 1 sheet of 3/8's Marine Tech I picked up cheap(waterstained) at my local lumber yard last fall. I am building a 16' skiff from it in a couple of weeks. It won't win you any beauty contests nor become heirloom. But for a in-shore fishing or utility boat knockabout I think it will work fine.Thanks Rick, It's held up fine in my Diablo also. When I first bought some I examined it pretty carefully and it appeared to me that it was pretty much like regular marine but without the great (usually) surfaces. I'll have to check the number of plys in the 3/8 and 1/2 that I have. I know the 3/8 has more than interior fir and I guess it would have to be 5, as four wouldn't make sense in terms of alternating plys.

[ 03-29-2006, 02:28 PM: Message edited by: Tristan ]

[Bruce Hooke]

If it's any comfort, there are very few places in the US were good marine plywood is readily available locally. Even here in Providence, in a state famed for its boats and its boatbuilders, the closest retail source of good marine plywood I know of is up in Boston...

[Bruce Hooke]

If it's any comfort, there are very few places in the US were good marine plywood is readily available locally. Even here in Providence, in a state famed for its boats and its boatbuilders, the closest retail source of good marine plywood I know of is up in Boston...

[Bruce Hooke]

If it's any comfort, there are very few places in the US were good marine plywood is readily available locally. Even here in Providence, in a state famed for its boats and its boatbuilders, the closest retail source of good marine plywood I know of is up in Boston...

[Venchka]

Originally posted by Tristan:


Hi John, Thanks for your reply. It's a question of what's available locally, costs pretty near the same as Marine, which I find impossible to obtain around Naples. ...Thanks again.Good grief. All the good marine plywood is made in Europe. Shelman in Greece, Joubert in France & Bruynzeel in Holland. With those resources nearby, marine plywood is scarce in Naples? Who'd a thunk it.

Wayne
In Texas. :D

[Venchka]

Originally posted by Tristan:


Hi John, Thanks for your reply. It's a question of what's available locally, costs pretty near the same as Marine, which I find impossible to obtain around Naples. ...Thanks again.Good grief. All the good marine plywood is made in Europe. Shelman in Greece, Joubert in France & Bruynzeel in Holland. With those resources nearby, marine plywood is scarce in Naples? Who'd a thunk it.

Wayne
In Texas. :D

[Venchka]

Originally posted by Tristan:


Hi John, Thanks for your reply. It's a question of what's available locally, costs pretty near the same as Marine, which I find impossible to obtain around Naples. ...Thanks again.Good grief. All the good marine plywood is made in Europe. Shelman in Greece, Joubert in France & Bruynzeel in Holland. With those resources nearby, marine plywood is scarce in Naples? Who'd a thunk it.

Wayne
In Texas. :D

[Ken Hutchins]

:D

[Ken Hutchins]

:D

[Ken Hutchins]

:D