Air bubble in the repair

[Gedis]

Hi, I am still fresh in this business, but want to be best in it!!! Lately I have been seeing small air bubbles in my repairs. In the beginning I never got a single one, and lately 80% of my repairs come up with tiny air bubble inside the impacted area. After I take of the bridge and put on the curring tab, repair looks perfect, but during the process of curing a tiny air bubble comes out from nowhere!!! What am I possibly doing wrong???
I live in Chicago and weather right now is about 80-90 degrees. I cool down windshield with A/C. Im using Delta kit and resin.
I am a perfectionist and I am not satisfied with the outcome. Does anyone have or had the same problem??? Thanks :eusa_pray

[boyd]

I'm assuming the air bubbles are in the pit only. Is this correct?
The air bubbles are in the resin. Hold your resin container upside down for about a minute or two so the air bubbles rise to the top of the bottle.
Don't shake the bottle. Put a couple of drops of pit resin just above the pit and allow the resin to "run down" into the pit. Look at the resin closley looking for tiny bubble as it's flowing in to the pit. If you see any drag them out with your probe so they don't go into the pit.
Another thing is to squeeze your resin out slowly.
Good luck
BOYD

[screenman]

Also when relasing the pressure on the bottle do not do it until it is the right way up and the resin has returned the the bottom of the bottle. This way you will not pull air back through the resin. We also find it best to have 2 or 3 bottles of pit fill on the go and use them on alternate days. This lets them settle. Another way is to store the bottles upside down this can help but we have found the others to work better.

[Glassdoc]

Sounds to me like he is using to much head pressure (injector is too tight against the glass). The injector seal should only be as tight against the glass as it needs to be so as not to leak. Any tighter and you will be flexing the glass downward and upon releasing the injector there is a chance the flex upward could suck in air.

[screenman]

Glassdoc if you read the question again you will see that the repair looks fine when he places the curing tab on, this would not be the case with your assumption as the air would show up sooner. Although I can say that many people have trouble filling chips due to excessive injector sealing pressure. The problem I think this guy is getting is due to excessive gassing up of the pit fill, due to to much air in it. This often does not show up until cured. If you have a vacuum pump it is possible to degas the resin by placing it in a vaccum, you will the see the air rise to the surface. This was something Novus discovered over 20 years ago so I cannot claim it as my idea.

[Gedis]

I do keep my resin upside down. When I called in to Delta Kits they also told me that the issue might be that I am over tightening the injector to the surface. When I put the curing tab on there is no bubbles, but then as I said it does come up from nowhere but only in the drilled place or where the chip of glass is missing.

[mafsu]

Just a shot in the dark. Are you wiping off the excess repair resin before applying the pit resin?

[Gedis]

No I do not!!! I leave it as it is and then once I have the curring tab on I wipe it down if it ran down...

[toab]

My L.R.super hard pit resin is very thick so I always keep it upside down in my box.I fish any bubbles if any out of the pit with my sewing needle or probe before dropping the tab on and curing.

[Gedis]

I would too, but the problem is that there is no bubble inside when I put the tab on!!!:mad: