So I'm told uv could turn piece yellow over time, which is fine in my case as long as still easily seen through. Anyone know if this is the case? Also would like to know how finished piece holds up to direct heat and moisture... could it be used as pot holder or coaster?
russw I do not know if UV does make Alumilite products yellow, they do have Alumi-UV which actually uses a UV light to cure and is supposed to be clear but I haven't used it to tell you how it works. But if you're very worried about it, I'd try the Alumi-UV. That being said, I haven't used a lot of the Clears to keep them in the light enough to be completely use but I haven't seen any of what I did use go yellow. The Clears are not supposed to yellow but there is no absolute guarantee that one might not do so years down the road.
Penny You should be able to paint over a Clear after demolding but you will need a primer to get the paint to stick well and then you have to make sure get the timing right or you won't get a good bond with the primer - it will always need a primer coat first before any paint has a chance to stick to any of the resins. You would be better served to paint the mold with a primer before pouring the Clear in it to get the best bond with the Clear. Or you can add the paint to the Clear when you mix it to ensure complete coverage without having to paint afterwards. If you paint it after demolding you must be very quick and do it before the Clear has gone too far into curing. To prime it you will need the heat of the cure to make the best bond for the later layers of paint to stick well.