On 28 aug 2004 you wrote :
By grafite I assume you mean graphite or carbon powder
Adding 5-10% carbon to epoxy produces a hard slick surface.
Adding 30-40% carbon to epoxy produces a soft plastic
The biggest problem with carbon/epoxy is it is messy. You seem to get black powder everywhere.
This was the Gougeon Bros. suggestion for the bottom of a trailer sailed race boat.
I prefer 5% aluminum powder and 5% silica. It is a light grey. It seems little harder and it is not as messy
I think I'm going to try your suggestion. Grey looks better on yellow than deep black.
I got one question though. 5% alu powder and and 5 % silica. Are those volume % or weight % ?
Wouter
By Volume
This held up very well on my 14.
I will make one change in the future. I will add UV stabilizer. It makes the material opaque to UV and it doesn't turn chalky as fast.
I bought some sold as an additive for water based polyurethane paint and later a local shipyard sold me some that they use as an additive to varinsh and epoxy paint. Try to buy it locally. It was a lot cheaper.
One more question, did you source the alu powder or make it yourself. Any suggestion what the best approach might be here ?
Thanks alot for the info
Wouter
You can buy it in the US as a West system additive: http:/