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epoxy resin over photos on wooden tray, if i use high gloss photo paper do i need to seal it first. ?

also, i sprayed the cheap decorative tray with flat black paint, do i need to sand and/or seal it before i add the photos and resin?  if i add about 1/8" of resin, does anyone know how heavy that might be, since i want to make sure it won't give out on the bottom. thanks  

orksecurity7 years ago
You should be able to figure the weight of the resin by figuring the area of the table, multiplying by the 1/8" depth to get volume, converting to liquid volume measure, then weighing the resin and hardener cans to find out how much they weigh per unit of volume and multiplying appropriately.

The question is going to be whether the solvents in the resin affect the photos -- either by soaking in and making them transparent, or by reacting chemically, or (if they're printed via digital) by making the dyes/pigments in the ink run. Unless the epoxy's manufacturer makes some promises here -- and maybe even if they do -- I'd recommend doing a test on spare copies before committing yourself.

Similar answer re the paint; the question is going to be how well the epoxy bonds with the paint and/or bonds through the paint to the tray, and whether it reacts with the paint. Again, the epoxy's manufacturer can probably give you an answer for that. GENERALLY speaking, epoxy bonds pretty well to most things, but there are exceptions.

Also, there's a simple question of appearance. How good does that black paint job look? Once buried under the epoxy, you're never going to be able to touch it up. Make sure it is as close to perfect as possible before committing yourself.

Don't forget that you're probably going to have to polish the surface of the epoxy after it hardens, if you really want it to be transparent. You also need to make sure you have a suitably transparent resin, and that it will stay transparent over the lifetime of the tray, but I presume you've already considered that.
great answer ork, I offer the following in addition to your considered response:
  • photos can be sealed or laminated prior to setting in resin which may protect them from a chemical reaction, and degradation
  • tutorial on resin casting here