Hello, I'm having a problem that I can't seem to find any answers for. I am trying to make photo tile coasters. I have applied pictures to ceramic coasters with Mod Podge. I then mixed some Amazing Clear Cast, 20ml each of part A and part B. I poured onto tiles, spread with a gloved finger and tried both a heat gun and artist torch to remove bubbles (sometimes, cant get all the bubbles out). The tiles I just made have been sitting now for 48 hours. They are hard to the touch, but when I put a hot coffee cup on the tile it sticks to it and creates a mark. Help please! Thanks, Daphne
Sounds like it's not completely cured or it didn't cross link enough. So let's go over a couple things to see if we can figure out what happened.
First did you mix slowly for a straight 3 minutes before pouring? Clear Cast has a long open time so mixing it for longer is fine - I time myself just be sure I'm mixing for long enough (cause I'm impatient sometimes and won't stick to that if I don't). Also I have to slow myself down as I'm used to using RC-3 where you need to move fast on mixing or it will cure in the cup.
I don't actually spread Clear Cast as it's "self leveling", it will level and become smooth all by itself. Also I pour from as high as I possibly can (usually about 6-12 inches above my mold) and pour in a slow, thin (almost hair thin) stream and let it flow over the object by itself.
And another thing, how long has it been since you poured? Even with adding heat to speed up the cure, sometimes it still will take 7 days for it to completely set up. You can still hit it with a bit more heat for a little while and see if that helps. I haven't tried it myself but then again I used it just to make castings and not as a surface layer.
Last thing, check the data sheet for Clear Cast and then the ingredients for your Mod Podge - it might be a long shot but something in the Mod Podge might be inhibiting the Clear Cast (as I think Clear Cast doesn't normally do this). Like I said, it could be a long shot but then again I just found out that Flex 30 will inhibit Plat 25 (that was a big disaster behind that finding).
Thanks for your reply.I did mix for a full three minutes, I let sit for another three to try to get bubbles to pop, then pour into the center of the tile and then I was spreading with my finger. I then use the torch to pop any remaining bubbles. I poured three days ago and like I said a hot coffee cup sticks and causes a mark on it. I'll have to check the data sheet and see about the Mod Podge potential reation.
Three days? That's part of it right there - even with heat to speed the cure up, Clear Cast will still come up sticky until it hits seven days. But definitely check the Mod Podge, it never hurts to eliminate other possible problems. And you're welcome, it's always good to hear how things work for others.