Ive read that your supposed to use water based acrylic on foam, but Im curious, what happens when you use enamel or some other paint. Does it cause delam, or some kind of chemical reaction?
Thanks
Rob
you can also use can spray paint… it has some kind of resins in it…
I know you should NEVER use oil based paint… and with other paints, don’t really know…
Cabeto
i was just wondering the exact same thing because I ordered a new board to be shaped and the shaping will be done within a couple days. my shaper still has a lot more boards to shape before they start painting and then glassing. I may ask him if i could pick it up and spray paint it at my house then bring it back to him before the glass sesh. hmm.
Okay, you have several things going on with paint.
The first one is chemistry: does the paint have something in it that will do a number on the foam. Y’know how polyester resin will make polystyrene foam into glop but epoxy won’t? It’s 'cos ( among other things ) polyester resin contains styrene, styrene monomer to be exact, which ( polystyrene and styrene ) will break down the structure of the foam. I’d guess that there are paints out there that’ll have the same effect on polyurethane-based ‘conventional’ foam. Lacquer, for one, is something I’d avoid. The solvents in that ( unsurprisingly referred to as lacquer thinner) has a list of ingredients that looks like an organic chemistry lab supply list.
Chemistry part 2 - is that particular paint compatible with the resin you’re using? Water-based acrylic is pretty neutral, no water to dissolve it involved in resin or foam, some others are soluble in some of the resin stuff like acetone and styrene, so they run or smear when glassed. And then it’s Too Late. You suddenly have something that looks like a late Turner ( http://www.victorianweb.org/painting/turner/paintings/speed.html ) which probably wasn’t what you intended.
Then ya got surface texture and permeability. If you lay the paint on thick enough ( or if it forms a hard, shiny surface, like enamels ) , resin won’t penetrate or permeate it, so it doesn’t bond to the foam mechanically ( resin getting into the little crevices and holes in the foam) so you have delam problems.
And theres color/heat - go too dark and too much of it and the sun heats it up and you have Mister Bubble, delam city.
hope that’s of use
doc…
Novice advice based on bad experience. Don’t use spray paint to paint your blank. You can paint a blank with a paint brush and acrylic. Not too thick like doc said. If you want it to look professional let the pro’s paint it. If you don’t care and like to have fun paint it yourself. Or, get the air brush and all that stuff. Mike
I was wondering this morning about using the India ink on sanded hotcoat technique (Signature thread) on epoxy.
Can this be done on epoxy? Any other inks or paint on sanded epoxy hotcoat?
Thanks,
Howzit rolliges, I use india ink for pinlines all the time. Not to many glassers use repidiograph these days but there was a time when they were the tool of choice and they use india ink. These days I refill old zig pens and poscas with india ink, they work great and I don’t think using them with epoxy would be a problem. Greg Loer should step in on this one since he’s the epoxy king. Aloha, Kokua
Ok i might have missed something as i just woke up (in aus)
but ive got an old single fin sanded it back. it has not been sanded to the foam.
my question is can i use enamel and then resin over the top of it?
thanks for replies.
No. wake up! Enamel gets melted by the resin, so the color runs…
Quote:
No. wake up! Enamel gets melted by the resin, so the color runs…
In that case what if i Ressined it then painted it in enamel?
Paint it with flat waterbased craft paint, then re-resin it. No problem
-Jay
That’s do-able. Water-base is the key…