I am having issues getting a nice even gloss coat on my board after it has been painted with acrylics. I hotcoat it, sand it up good, spray on the acrylic paint (nova paints, and this doesn’t seem to be a color specific issue). I then sand it up with 220, wipe down with a wet cloth to clean it. I then gloss it with epoxy using the correct amount of f-additive. As I lay the epoxy out it seems to cover but within a minute or two I can see it start to separate and reveal dry spots. This last time I did one acrylic stripe down the middle and I noticed this separation only occurred on the painted area. I’m pretty meticulous about hand oil and other contaminants. I ended up sanding it down and giving it one more gloss. This worked but is isn’t ideal and adds weight. Anyone out there with similar problems and/or remedies? Thanks in advance, Justin
Here’s a pic of the current project that this happened on.
I’ve had the same problem also and I was told the Nova paints could be used at any stage of the epoxy board because of the 100% acrylic factor. I agree that painting the foam and then glassing is the ideal, but I’m also looking for answers to why a clean board would act that way. As a production painter (office furniture / clear finish) It looks as if there is a blocker or contaminate and I’m not sure why if the area and board is clean. Any feedback is helpful.
In the history of making boards painting on the hotcoat and glossing over has never been a very good option. Your depending on a water based paint to hold the things together. Water based paint is far from structual so as soon as you get a little flex going all bets are off. Like was suggested above, paint the foam. Bonding to foam is far more reliable. If your going to paint the hot coat, finish with a 2 pak UPOL or a flat spray finish like the one from Fiberglass Florida.
i had the same thing happen to me . but i figured the paint wasnt dry enough. the epoxy would pull away from the painted area so . the moisture in the paint could escape . even if it feels dry doesnt mean it is
Howzit sonny, The Japanese add something to their Nova paint which actually keeps it flexable. This is probably what makes epoxy not adhere to it. Most dried acrylic paints are hard ( check any drips on the container) but Nova stays flexable, kind of tripped me out the first time I saw this, but it is great paint. Aloha,Kokua
Just wanted to give an update to this issue after using the board for a year+. I painted the hotcoat with Nova paints, glossed over it twice (due to the separation issue). The board has had minor pressure dents and zero dings. I am not a lightweight either (almost pushing 200 lbs. and 6’2"). So, from a structural integrity standpoint, it worked. Just thought someone out there may like to know.
yeah i had the same issue...epoxy almost beading away from the paint...i just let it separate and went back in and filled in the holes later...sine the epoxy had nowhere to go it cured in the holes...then i went back and sanded everything and it was fine
