Pressure Cure

[deputy_ben]

I am new to the windshield repair business and I would like someone to explain the technique of pressure curing and explain the benefit of it.
I would also like to say that this forum has been and continues to be a valuable resource for all of us. Good job guys.

[mafsu]

Pressure curing simply means curing the damage while it is still under pressure from the injector. I use it when doing bullseyes to prevent the resin from shrinking during curing and causing lines on the outside edges of bullseyes. I don't pressure cure stars I do however cure them before adding pit resin.

[deputy_ben]

What is the reason for curing stars prior to adding pit resin?

[Zach's Glass]

ok that makes sense how do you cure under pressure?

[GlassStarz]

Simple Just remove you UV shade and leave the injector on the glass for a couple minutes.
If working inside just put your light on it for a few before removing your injector

[mafsu]

Deputy Ben, the short answer to you question is it will make your star repairs look better. The long answer is curing windshield repair resin causes a chemical reaction which will cause a small amount of gases plus air that is still inside the damaged area to rise to the uppermost area of the repair. Placing pit resin over the damage before curing will trap these gases inside causing more scarring than is necessary.

[screenman]

Mafsu,

Going back a long time Novus used to supply small black dots of vynil to put over the pit when curing and before you applied pit finish this kept the resin in the pit uncured which allowed the pit finish to get a good grip when it was eventualy applied.

The reason why the gases do not excape when you put pit fill on before curing is due to the fact that pit finish cures much quicker than the resin used to fill the crack,thus stopping the gases from rising out of the surface.

I do not know where you got this info from it sure goes back a long way and it does work.

[mafsu]

Screenman I came across this info through trial and error. Just trying different things to get a better outcome. I didn't at first know why it worked, only that it did and provided better cosmetic results. Someone on this board (I apologize that I don't remember who) explained the technical reason in a post quite some time ago. The black dot is not a bad idea, but it is probably not necessary as the resin at the surface is exposed to air so it will take longer to cure than that in the legs.

[deputy_ben]

I just wanted to thank everyone that has responded to this post. I tried your ideas in the field today and they worked beautifully. Thank you. I was having trouble with some small black spots in the finished repair but they have gone away with the methods you described.

[nwglasspros]

How does the uv light get to the filled damaged area with the injector covering it?