RE: using a tack rag
To properly use a tack rag, unfold it completely. With it unfolded, drop it onto the surface to be cleaned and lightly pass the rag over the surface. DON'T rub it or the wax will transfer to the surface and leave fisheyes on your finish. It is only intended to pick up the dust, lint and etc that has collected on the surface. Then, if you feel necessary it can be cleaned with "prepsol" or any generic paint cleaner.
It is NOT absolutely necessary to use a tack rag before painting, Only if you think it has been sitting long enough to have collected dust and contaminants.
Chip Mull
F&M Enterprises