I just tried to peel that masking tape off. Boy what a PITA. I wont use masking with this stuff again. I didnt know it was going to be such a controlled flow of it. I thought it was going to be like spray paint, where I need to take off where the excess would be.
In the other corner, where I knocked out the overflow, I will use tape though. Im gonna put a couple random shaped shelved of acylic over there too, and coat that with the foam, so it looks kinda like a rock.