Yes this is available in black through the special order desk.
This is class C product.
yes the molding and caps are available through the special order desk. Panolam
The backside is smooth to allow for adhesion to the wall. We would not recommend adhering the cracked ice side to the wall as due to the texture it could be hard to get a good bond. We do offer a smooth version of the FRP which is available through the special order desk.
yes this product can be painted, we don't do any testing on any specific brands or types of paint but see it painted in the field very often,
yes 867 1/4 in. x 3/4 in. x 8 ft. PVC Composite White FRP Cap Molding is the correct trim to go with these panels.
While we don't test this material for painting we do know many customers do this with success by using latex paint. I would suggest testing a few panels first for adhesion before completing the job.
yes this product is often used as shower walls.
Yes it can as long as the material doesn't get above its maximum operating temperature.