Rob, i have not actually used or tried the sandpaper trick as of yet. Actually i think that was recommended to me at one point by davo from hyrel. I think he said he used 220grit. You could shoot him a pm. As for psa paper though try indasa redline in 2 3/4" rolls. I hate indasa paper for sanding but it does have a much stronger adhesive than 3m or norton. Its also alot cheaper. Once you cover your bed with it inwould rinse the paper with some water since mist sandpapers have a anti loading agent in them called stearate. This would probably effect adhesion of the nylon. Abs slurry doesnt work. For nylon its either garolite, a cellulose type board like mdf or actual wood like poplar. The third choice is actually a piece of nylon. I think thats all you got to choose from. My 618 is gone and i have a roll of bridge sitting here now for a couple months which i have yet to try but its supposed to be easier.