I am planning on using it to install my new windows without using bolts in about 3 weeks. I bought 1/8" thick. I plan to to recess it about 1/8" behind the plexiglas all the way around. Then I'll fill the gap to a nice bead with sealant all the way around. That should allow the plexiglas to expand and contract without breaking the seal. I'll let you know in about 5 years if it worked!
Gary H. Lucas