MF,
I have plenty of garbage wheels but that is what most are garbage, I pull any inserts out as soon as I get any that are any good. I picked up a couple of tubs of the Dunlop stuff so I could repoint all my ridge tiles for $45 I think it id about $37 a tub at Bunnings. If it stands up ok then even if I had to buy a tub it would make about 500 wheels I would think so more than enough to see me out. I would expect to run out of PT's before then