In recent years, auto glass technicians have become more aware of contamination problems. One area of contamination is the pinchweld itself. Each time you put primer on the pinchweld and then dip the dauber back in the can you have contaminated the whole can. Many technicians today use a new dauber, dip it in the primer and prime as far as it will go, then discard the dauber and use a new dauber. For this reason, we offer these high-quality wool daubers. Made of a thick wool tuft that is held tightly in the center with a strong wire.