Im having a problem having my boards come out pearly white. Im using epoxy (RR) for the lam and hot coat. I have EPS core blanks thats sealed with DAP fast and final spackle. My sanding tools are clean as well (changed out heads on air grinder).
But still you can see the lams are turning brown and not the color of the blank which I want it to be. Its not a deal breaker for my customers but Im starting to get concerned.
My shop is fairly clean, but maybe still some contaminates?
If you want real WHITE, like windsurf boards, you have to spraypaint the color on the final coat.
Lam coats tend to be a slightly gray/green.
The browning is probably from using tap water to thin the spackle, or just the spackle itself. If thinning with water, try using distilled water and clean tools. If right from the container, change the spackle type or go with an epoxy slurry to seal.
No believe it or not the spackle actually gives the blanks even a brighter white when I seal it. It doesnt really need water too because at the bottom of the bucket you can mix some in there. The blank before it is lammed is clean and white as can be. Only when I start to laminate I run into these problems.
Like I said, all clean tools, clean environment, just dont know what else could cause it.
Leed are you suggesting doing a matte coat of paint before it is sent to gloss?
White paint under the gloss.
Makes a popout look, but someone wanted pure white without weave, laps, or dirt showing.
Back in the '70’s, Volan glass with white lam resin were a favorite…Just a hint of the green weave came through…
Pete’s right. I don’t know if you thought about it, but spackle is water soluble and therefore has water in it. Do you think Dap uses distilled water. A blank may look brite white the day you spackle but turns brown/yellow in a day or two. If you want brite white; just tape off the stringer get out your cup gun and spray it white with any flat white paint. Very simple. I like using spackle and I reccomend thinning it with Distilled water or Acrylic floor sealer. Lowel
[quote="$1"]
Im having a problem having my boards come out pearly white. Im using epoxy (RR) for the lam and hot coat. I have EPS core blanks thats sealed with DAP fast and final spackle. My sanding tools are clean as well (changed out heads on air grinder).
But still you can see the lams are turning brown and not the color of the blank which I want it to be. Its not a deal breaker for my customers but Im starting to get concerned.
My shop is fairly clean, but maybe still some contaminates?
[/quote]
Sir, You asked this question before. Maybe you did not like the answers. Seems like you are getting the same answers this time...same as last time.....Last time when you posted a photo it was impossible to see the problem.....no photo today.....
Same problems......find a friend with a good camera or a Smart phone and post photos of the problem. Several pros have tried to help you.......If your Lams are turning brown...something is wrong.....but the photo you posted last time....I did not see brown lams.... White pigment? Next you will have Light Brown problems.........
No I love the answers. Of course I appreciate it all but Im trying a lot of different options here and none seem to work. And yes the photo is a little dim but the problem is there. I will have some good photos soon hopefully.
I think I mentioned this before; Heat----- created when you grind the laps.
Read this thread.
http://www2.swaylocks.com/forums/apex-epoxy
Acqua Glassing talks about problems with the laps. What caused them and what he did to fix the problem.
I have a whole quiver of pigments and tints....maybe you should switch to colored boards....it's much more fun
Stingray
If you are grinding laps… Minimal exposure is key. If it takes you 3 trips around the board…it takes you three trips… dont hover. Poly is much less heat tolerant than epoxy. Unless you go SUPER opaque the tints especially white will still show a burn.