Ive been making boards for about 2 1/2 years and i keep getting the same problem which i have not been able to solve.
If i have sprayed a board with acrylic paint (the same paint other board makers use where i live) and in particular darker colours, blue, purple, red. The lap on the deck from the bottom layer of cloth changes the colour of the paint, or better describes it lightens it. These images may show it clear enough for you to see.
I have tried: clear coating the paint, using different resin (UV and non UV), sading laps and not sanding, using wax on laps to sand etc.
Nothing seems to work, although clear coating the colour helped a little but not enough.
Please help as im desperate to figure this out as i just hate the look it creates and for good reason. Ive searched this site and more many times and cant find anyone having the same problem
After you paint the board let it dry for 24 hours.Get a 4’ paint roller and a tray catalyze enough lam resin to cover the entire deck and rails of the board, roll the lam resin on the deck and rails making sure there is no dry spots. Let the resin cure" you can use uv resin also, just dont leave it in the sun for the entire cure move into the shade or inside a couple times so it won’t get to hot. Then lam the bottom of the board and the free lap will not be noticable when you lam the deck
Tom, very nice board and good advice! I counted the stars and all 50 were there! The pedantic bastard that I am has to mention though that you left out one red stripe though. Which one of the original 13 states does not deserve to be represented on your board. If I were to chose one it would be New Hampshire since it is next to Vermont.
I’m guessing it isn’t the paint or the resin. I’m thinking it is something in the lap, and it just shows over the paint. Dust, surfacing agent, air froth, anything could be ghosting.
Tom that is a nice looking board and im sure your process will work. Im not too keen on adding an extra step nor adding weight, albeit not much. I also have a slight hesitation in laminating without the cloth as that first layer really soaks into the foam and adheres the cloth to the foam. Any further thoughts with this?
Everysurfer, i think you are on the money here. dust is a possibility. what do you mean by air froth?
Air froth, in epoxy, air in the resin from overworking it. In polyester, it could be from air in the cloth of the free lap, meaning you pulled off too much resin and there is air in the weave of the cloth. Too dry a lamination. Either that or the free lap is OK, but a little rough in texture, and the second layer trapped little micro bubbles.
Either way, I think it is in your laminations, not the paint.
I’ve had this happen even on installing fin boxes on the painted foam especially green as Reverb said so I rule out the fiberglassing. I feel it’s an reaction from the catalyzed resin on the the paint. All the boards I airbrush get sealed with a coat of lam resin after paint to guarantee I never get that flashing, it adds very little weight and the bond is the same since it’s poly on poly. I don’t do this with epoxy cause I never had this happen over paint
…hello Everysurfer, in the 2 photos is only in the lap and the changes you see for ex in the blue board, is due to the wetted out process with the squeegee also you can see the fibers strings.
In the other too, then you see the paper in the logotype, becasue of the dark color + not close cut of the paper + not so good paper quality + water based tint that leaves a residue that with time the paper turns brownish (happened a lot in the 80s)
—thick coats of paints and bad mix is the other problem associated.
Thank you to everyone here. There are a few things that i will try with this next board. The paint has been left for 48hrs before glassing. I will make sure the wetting out process is sufficient ( i dont think this is my main problem) and will not over work the lap. This i think could be the problem after reading other threads on this topic.
The moisture possibility is interesting to consider but i would assume it should show on the whole board also.
Reverb, im curious on your take on the paint mixture? im spraying acrylic with 150% thinners. Also just on the decal. i ran out of decals as waiting on new artwork. Bought some rice paper from local art store and printed through my printer to get me out of trouble. Not ideal i know. appreciate all your comments here.
Tom, i love the shape of the black/white quad, very cool indeed. Also do you have trouble with the cloth sticking to the lam after your first coat? seems like it would be hard to move once layed on the board?
I never had a problem with the cloth sticking , try a sample on a scrap piece of foam , you have to give it time to dry and the cloth will slide easily on the board when your ready to lam
Let the paint dry throughly. Never had a lap do that whether I paint the board or a pro in a glass shop paints it. Epoxy or Poly. But sealing it with lam is a good way to avoid it. You keep saying you are using the same paint as all the local builders, but you haven’t told us what particular paint that might be. Is there some reason for that?? Also was wondering what cloth you are using?? Brand, type and weight. I notice it shows around your lable/laminate as well. And Everysurfer could be right; You may be pulling off too much resin resulting in a dry lam. You might try using a “cheater coat” after you have completed your lam. Is the color change on the deck only?? Why such wide free laps? Why not do a cut lap??