[Brent Deines]

I'm not sure I have much helpful advice on this one as I can't say I have experienced this problem, but when there are air bubbles in the pit resin they will sometimes show up in the break, especially after curing, which is why we always recommend storing the pit resin upside down prior to doing the repair. In addition to storing the bottle upside down it is important to keep it in that position while removing the cap and applying the resin.

Although we tell technicians over and over again, in training classes we see the bottles being turned upright as they remove the cap, thereby allowing air into the tip, and the longer a technician has been doing windshield repair, the harder it is to break them of this habit, myself included.

This may not work for all pit resins due to viscosity variances in competitor products, but it does work quite well with Delta Kits Premium Pit Resin and Premium Plate Glass Resin.

For whatever reason we have had a rash of breaks with large pits in our practice glass used in training classes over the past few months, so we have had the opportunity to train a number of windshield repair technicians using the fill and drill method used when working with large pit areas. To the best of my knowledge none of those repaired in the training classes had air specks in the finished repair.

I know it's a long shot, but sometimes it's the simple things that make all the difference, and anything below the pit resin should be filled just as easily after capping as it would be if capping had not been necessary.