If I have a really gummed up sanding disc or belt before I throw it away, I have a really fine 8" stainless wire wheel on a bench grinder that I will lightly hit the gummed up paper, it may take a little of the grit off but not as much as you would think and it takes the gunk off. I can do this two or three times before I really start noticing a difference in the sanding action. To me, that is better than throwing it away and it's pretty quick too.
I find this really handy when I find something I don't like after I put a finish on and must remove it. I can gum and clean a 400 grit two or three times when sanding between coats. Pictures are of same 220 grit disc.


I find this really handy when I find something I don't like after I put a finish on and must remove it. I can gum and clean a 400 grit two or three times when sanding between coats. Pictures are of same 220 grit disc.

