I have a ( little) rot

[Puka]

Where do you draw the line on degraded wood removal from the hull;bearing in mind I am a realist, my life is short,my resources are limited.
Is discoloured hard timber salvagable? Does anyone
have a simple test (puncture/ pressure)to ascertain the state of timber?
The timber is NZ kauri-age 35yrs.
Ah,hmmm,while your at it, how long is a piece of string?
*I am already aware that my life might be a lot shorter if I dont replace all of it.
*I blame it on SWIWMBO, she made me take the paint off.
Imagestation (http://www.imagestation.com/album/pictures.html?id=2130491226&idx=11)

[ 03-08-2005, 01:54 PM: Message edited by: Puka ]

[Joe ( Cold Spring on Hudson )]

Puka you are trying to post a photo directly from your C: drive you need to put it on a image website like www.imagestation.com (http://www.imagestation.com)

Or you can email me reachbutter@aol.com and I would be glad to post the image for you.

[Wild Wassa]

Puka, a wire brush on the end of a drill describes all. If you are agressive about the repairs the wire brush could be your first tool ... you will soon know what needs replacing.

Have a good read about CPES firstly (or a similar product), CPES is much more than just a sealer.

Any Kauri that (that you might want to keep bright) is sound but discloured can be bleached back to life. There are four basic bleach types for wood, one will suit Kauri. Unless another Member knows, this might require testing, read the Forum archive ... I think it might be oxalic acid but this needs checking.

Warren.

[ 03-08-2005, 02:04 PM: Message edited by: Wild Wassa ]

[Puka]

Thanks.Is it available in Oz? It isn't here. Seems
the formula for CPES is somewhat different than just thinned epoxy.

[Wild Wassa]

Puka, the distributor for CPES and Fill-it in Oz is Senseal Pty Ltd, in Melbourne.

JOHN WARSZAWSKI
Fax: 61 3 95008086
Mobile: 0419 399 739

The website for Senseal P/L

http://www.infolink.com.au/view_company.asp?companyid=2 8033 (http://www.infolink.com.au/view_company.asp?companyid=28033)

CPES is different to nornal epoxy as you have noted, it requires a heavy wet out on old timber. CPES is 70% solvent and not much thicker than water. CPES smells like a cocktail of xylene and acetone ... real heady stuff. CPES encases the existing rot, depriving the rot of nutrients ... stopping the rot. I give three coats of CPES in quick time or until the timber stops absorbing it. I use lots of CPES on endgrain, endgrain can be like an insatiable sponge.

If bright is required, I'd consider bleaching the degraded timber before CPES'ing. CPES can turn (some) degraded timbers jet black. It turned one Douglas foil that I restored into looking like Zebrano, Zebra wood, :cool: .

Warren.

[ 03-08-2005, 03:10 PM: Message edited by: Wild Wassa ]

[Stiletto]

At 70% solvent how much is epoxy? the solvent is the vehicle to get it down into the pores. I dont know of a source in NZ so have used thinned epoxy and achieved good penetration judging by the amount soaked up. However this was for parts that were later covered in unthinned epoxy. I suggest you mix some epoxy and thin it 70% with meths and try it on a piece of scrap. You will see a lot of absorbtion if there is much endgrain to suck it up, particularly if the work is heated to help keep things runny.

I think everdure is a Kiwi cousin to CPES, you could try that if you can stand the price.

Good luck with your repairs, I like those Stewart 34's.

[Wild Wassa]

Stiletto, I guessed 70%, it could be much higher. The first coat just disappears. 1.5 lts gives a good coverage on the hull (only) of a 15ft dinghy. I'm pleased with 70% evaporation but I'm hoping for 90+.

If you are thinning normal epoxy it is important that the thinner is a reactive agent with the epoxy, otherwise the structure of the epoxy can be weakened. It is not advised to use a denatured acohol (which I'd expect, like a denatured ethanol) with Boat Craft Pacific's epoxy. TPRDA is my poison of choice, not as a wood preservative but as a thinner.

I though that I might buy acetone today, at a boat shoppe. 500mls of acetone from Norglass Marine Paints costs $9. 1 lt from Bristol costs nearly $8.

Avoid that word marine, if possible.

Warren.

[ 03-10-2005, 11:42 PM: Message edited by: Wild Wassa ]