So much for board number 2. Guess what? Krylon spray paint isn’t acrylic even though the lady at Krylon told me it was. I now have first hand experience at what a EPS blank looks like as it self destructs. Pretty damn cool to watch, like a science project. I was proud of that one too. It was heading to the artist tomorrow. Live and learn, huh…You masters can stop laughing now 
Why were you spraying krylon on your blank?
HAHAHAH please post pictures
I was putting some color on the bottom that a guy was suppose to do some pen work on. I didn’t know what type of paint it was. It didn’t say on the can, so I called Krylon and some lady told me it was acrylic. Apparently not.
If you using spray paint on EPS use Design Master. Get it at Michaels. Don’t spray it too close or it’ll eat the foam too. Spray from about 12-18 inches away and it works great.
We have a Michaels. I’ll check and see if they have it… The deepest places are about 1/4" deep. It may be salvageable.
Pic
eek! to late but next time try it out on a scrap piece of foam just to be sure
yeah, I did test with my paint pens. Guess I got in a hurry with the paint. Won’t happen twice.
yeah alot of things that spray out of a can, eat stryofoam…test it first next time…“stryofoam”…i just cant believe it.
what is it in the acrylic spray paint ingredients that causes this? is it the xylene?
thanks, Brennan
Krylon spray may be acrylic, but it’s probably not waterbased. The solvent in it is what eats the foam. As everyone else said, test first… I guess lesson learned, huh?
regards,
Håvard
Brennan, Haavard has it right, there’s Acrylic Enamel, Acrylic Lacquer, and Water-based Acrylic (acrylic latex). The first two will melt polystyrene… Headhigh, can you mix up a batch of epoxy, q-cel, and styro bits so you can batter over the damage? I mean REALLY thick like peanut butter, to save weight? Styro bits would be busted-up eps (trying to get it down to the individual cell size). Then just do an opaque pigment cutlap with your epoxy batch. A swirl might do you right…
just to save you from the next possible frustration, after you made your paint test on a sample foam do the lam test to see if you have resin/color problems. some pigments do not like epoxy and change color,normally from nice to horrible.
“Acrylic Lacquer” - Thats exactly what she said. So I figured, there’s the word I am looking for, must be okay. LOL…After looking at it again this morning, its ruined. By the time I take the foam down to where it needs to be, I’ll be all over the seam and fiberglass stringer. It’ll now have to be my official testing ground for all future stupid, or not so stupid, ideas. Thanks for all the help and ideas!
What if you shaped off the 1/4" of ‘custom honeycomb material’ you made and laminated on a 1/4" sheet of corecell or something else flexible? You could even do it in 2 pieces, either side of the stringer, so you kept that look. Even if you don’t vac bag it on, a bunch of big-size Ziplok bags full of water or sand would provide all the clamping pressure you’d need…
“LACQUER” that’s the key. Lacquers dry by solvent evaporation. Enamels dry by oxidation. These two terms reference the vehicle that carries the pigment. You’ll not find a water-based “lacquer” but you may find water-based enamels (doubt it tho) and of course water-based acrylic is what you wanted.
Yup, no substitute for testing. It beats learning the hard way. Surfboard making has so many little areas where proper care is essential to a good result.