I’ve read a bit in archives regarding painting on boards, and wanted to check to see if anyone has had a problem with delamination under rice paper lams with heavy layers of paint. I’m thinking of painting (with a brush) right onto rice paper and putting it between the foam (polyurethane) and the first glass layer on the deck (polyester resin).
I’m wondering about potential problems if I use a thick layer of acrylic - I want parts of the painting (~8" x 11") to be opaque. I’m thinking a thin layer of resin underneath the rice paper, and then resin on top and well into first glass layer.
Will the resin will adhere to the acrylic paint well enough? Anyone have any experience/problems with this?
It will work just fine, but don’t put the paint on super thick or you’re likely to sand it off later because of the bump. You might want to iron it between to sheets of paper when it dries to get any wrinkles out. When you’re ready to glass, make sure you get enough resin underneath the whole image to stick it down good. I’ve had 'em pop in the sun and seen others do it also (professional screened lams), and the likely culprit was not having enough resin between the lam and foam. Squeegee it out a little, lay down the lam and lightly squeegee that out then glass as usual.
I’ve used regular white Krylon enamel paint on the backs of my lams for years without any problems. Originally, I tried acrylics but the water runs the ink on the other side and wrinkles the paper badly. The trick to using the enamel is thick, heavy, rice paper. Tape it stretched on a piece of cardboard and give it no more than two light coats. Lightly sand the painted surface if it isn’t smooth, cut it out to the border. Brush a thin coat of lam resin where you want it, put it down, cover it with a scrap of 6 oz, and squeegee on the cloth hard with plastic one working from the center to the edges. Cover it with 4 oz, hotcoat, etc. Enamel paint is never compatible with poly resins, but I’ve never had them bubble, delam, or any problems. I think that the paint is absorbed into the rice paper, and the thick paper is what makes this work. I have also found that many of the paints used in regular silkscreens aren’t compatible either by themselves, but work OK when put on rice paper.
It will work just fine, but don't put the paint on super thick or you're likely to sand it off later because of the bump. You might want to iron it between to sheets of paper when it dries to get any wrinkles out. When you're ready to glass, make sure you get enough resin underneath the whole image to stick it down good. I've had 'em pop in the sun and seen others do it also (professional screened lams), and the likely culprit was not having enough resin between the lam and foam. Squeegee it out a little, lay down the lam and lightly squeegee that out then glass as usual.
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What do you mean with resin. the mix of epoxy resin with hardener or epoxy or hardener alone? I wil make my sign on ricepaper with the ink printer, this ok? And is it better to put it between the foam and first layer or between first and second layer of glass?\
ps. I make a board off EPS 200 wiht epoxy resin hardener and glass