i glassed a board and sanded the laps way down cause it was a bad lam job. when i hotcoated i could see white where i sanded still. the hotcoat dried and i can still see them. usually it just disappears. if i basted them with lam after sanding would they disappear?
do you mean the cloth is sticking out?? basting always works well if you have a bad lam. job, just a light coat.
no they where i sanded it shows cloth will basting stop this?
yeah, try basting lightly and things should go smooth. if any problems, post and let us know.
Try wiping down the sanded area with acetone just prior to hotcoat. And careful when your sanding, use a low grit and don’t let it heat up.
Sounds like you might have had some dry lam areas there. Cloth will still show if it was not saturated good on the lam coat. Hot coat wont penetrate once it is coated with resin. MLC
Howzit Rook, for this application styrene works better than acetone. Aloha, Kokua
what’s blasting?
Thanks Kokua, I had luck in the past on some problem boards with the Acetone, but haven’t tried styrene. And hopefully won’t have to… I’m glad to say, I’ve had no problems on my last 2 boards - I’ve used nothing but a razor blade and some basting to smooth them out. Sandthrough on my hotcoats has been minimal, and sanding in general is much easier… kinda enjoyable?
Styrene will usually hide any light, or sanded areas of glass, as it is pure resin, with additives, and is thinner than water. Acetone will sometimes melt the lam resin into the cloth, producing the same effect. I guess the problem comes in when you burn through the hotcoat and cloth, and then it is thinner than the surrounding areas. It is hard to say without seeing the board. Personally, I paste my laps with some lam resin prior to hotcoat, just to give me some extra resin to work with, and it helps build a nice edge. Hope this helps…
Whoops! I meant styrene has NO additves. Damn, and in public…