Curing under pressure.

[starstruck]

Did a repair yesterday that I would describe as something that looked like a half moon pocket with slightly longer extensions off of it. It filled in fine under pressure but when neutral, a small outline of the pocket was still visible no matter what I did. Vacuum and pressure cycles, flexing, slight heat, nothing seemed to help remove it. Under pressure it would go away. So I decided to cure it under pressure and it ended up being a perfect repair that was nearly invisible. The customer was thrilled with the results. Do any of you occasionally use this tecnique on a stubborn damage?

[GlassStarz]

I like to cure under pressure in most cases I find the fill is better I know delta and some others dont approve of it and with that type of injector you may end up prone to problems im not sure . With the LR injector it doesnt seem to have and problems. The science answer would be when you remove the injector and relieve the pressure you will have some back pressure allowing some air in or resin to back out If you leave it under pressure to cure this doesnt happen but for whatever the reason I personaly prefer the result with a Pressure Cure I take the cover off allow the sun to hit things for a couple minutes remove the injector apply cure tab and cure normally

[screenman]

What is sun?
I also cure under pressure but only as a last resort. You have not got rid of the air just compressed it and in time it may come back, but if you are lucky it will not cause any problems. I find in most really stubborn cases a small amount of heat under vacuum and then reapply pressure whilst it is cooling cures most problems. I hope this advise is of some help to you.

[harrellbenjamin]

There has been times with using the injector(delta) that as I have what I think is a great fill upon removing injector and tabbing ,air is reintroduced into the break.I would immediatly reapply and repressure cycle a couple of times and have same problem.In those cases I have found that letting the repair cure for several minutes and then remove injector and pit fill and tab would cure the problem.JMHO

[dgarza]

this also happens to me, mainly with bat wings and bullseyes. I also try to cure under pressure. sometimes it works sometimes it doesn't. I have been told it is due to too much pressure from the injector but the fact is I have tried many different pressure seetings and it still happens. a couple times i tried so little pressure that resin was beginning to come out from under the seal and it still happened. after 3 years of going through this I'm starting to believe it is just something we will have to live with on some repairs.