One question for you experienced guys.. What do you use for a backer board? I happened to have a sheet of Masonite laying around so I sprayed it black and used it this time, but what do you find works the best? Also Do you just paint the backer board or do you glue felt between them? And lastly What do you use to glue them together? Tight Bond, spray glue, tacky glue? I used Tight Bond this time and it was a pain to paint on the back and I had a bit of squeeze out that I had to clean up, which was a pain in the small spaces.