4 Tips about Spray Guns vs. Cup Guns July 7, 2015July 7, 2015FGCI G830 2.0 HVLP Spray Gun Product # 130354 G100-6 Professional Cup Gun Product # 130295 1. Cup guns will spray gelcoat straight out without having to reduce the gelcoat first. 2. Spray guns depending on the tip size may require reduction with Patch Booster or Duratec. 3. Cup guns are generally used for mold application. 4. Spray guns are generally used for re-finishing parts. Share this:TwitterFacebookLinkedInLike this:Like Loading... Related