trims

I don't understand the correct way to go about installing an LED strip into a pocket or recess. Tiler, a pro, very clean work has no simple solution either. What would really help is an 8mm tile trim with a wide "span" (not sure of correct term). 2cm is not enough to play with (that's NOT what...

Hiya, I am going to re-roof my roof by using fiberglass. I got most of the stuff needed. However, I notice that they use acetone to clean the trim before applying the resins. Can I skip this part or is there any alternative? Thanks,