Melloelky pretty much covered all the bases. Never use a micro fibre or any other type of fabric towel for wipe down, always use fresh clean PAPER towels for that.
For all the reasons he listed above.
That way there’s absolutely no risk of contaminating the surface. Yes, no matter how good the quality of paper towel you use, there will be some slight lint or dust left behind, this is the reason the tack rag is the FINAL step before paint. The trick with the tack rags is to make sure they’re not TOO sticky, and to only VERY LIGHTLY pass it over the surface you’re going to paint. As noted, you don’t want to transfer any of that stickiness to your panel. It should be passed over what you’re painting with nothing much more than the weight of the tack rag itself.
And you guys are wearing disposable gloves anytime you’re touching the work, RIGHT??
My order before applying any paint or primer product is always, in this order:
1). Apply wax and grease remover to the surface and a folded up CLEAN paper towel in one hand.
2) Wipe off the wet wax and grease wax with a second CLEAN folded paper towel in the other hand. (Think Karate Kid’s “wax-on, wax-off” method here). This floods any possible contaminants to the surface when it’s wet, and the dry towel removes them.
3) Let the surface air dry naturally for several minutes before applying anything. If any of the wet wax and grease remover got into any crevices you couldn’t get at, it will have a chance to evaporate before air from the paint gun pushes it out onto your surface.
4). LIGHTLY blow off the surface with compressed air. This will remove most of the lint and dust left behind by the paper towel, as well as showing you if there’s any “still wet” wax and grease remover in any crevices.
5). Give the entire area a couple of thorough but VERY LIGHT passes with the tack rag, then one more final going over with compressed air after that. No transference should ever happen between the adhesive on the tack rag and the surface.
6). NOW you’re ready to paint or prime.
Hope this helps gents.