N
northerndave
What are you guys using when you need a truly rigid block for blocking filler/primer?
Acrylic sheets from home depot. Cut to shape however you need. The thinner flexible ones work amazingly well. Use them from filler through the first round of wet sanding clear. Also have Hutchins blocks. Check out Jeff Lilly restoration website. They have a page about making blocks.
I've read that piece but never had any luck sourcing the rubber he mentions.
http://www.jefflilly.com/build-tips/black-sanding/
3m Gold 320 is the absolute worst I've ever used for leaving adhesive on a block (specifically Durablocks). I can't tell you how bad it is for me. Entire sheet of adhesive will cling to the block sometimes. IMO 3M is the worst for leaving adhesive on the block in almost all grits but especially 320. Been using Mirka Gold and trying some Norton that does much better than 3M in terms of leaving adhesive. I can't tell any difference in how those brands sand versus 3M either.