Cure Under Pressure

[magicogar]

Sorry if this topic was mentioned but I couldn't find it anywhere. What's cure under pressure? Is it when you cure the crack while the bridge is still attached and undergoing pressure cycle?

I repaired my first bullseye on my own car today and it failed in a way. I was able to fill the entire bullseye with resin and cured it. It looked great until the next day when half the bullseye opened up. This was an old bullseye tho and I applied tons of rainX to my windshield.

Oh well, I'll continue to practice on my practice glass. It seems so easy when you're doing a fresh crack on a practice glass. Do you veterans ever stumbled across those old cracks where it cured great on one day and opened up on the next day?

[glassdoctor]

Very rarely, but you probably nailed the culprits... old and "tons o rain-x". Repairing a bullseye with water in it will give a similar result... it may appear clear when you're done, but later it will be cloudy at best. Other thinkgs could be maybe it wasn't fully cured? Were you using "good" resin? That's the only other thing I can think of...

Pressure cure? Yep, you got it... just means you cure it while the bridge is still on and under the pressure cycle... then you remove and fill the pit and continue curing. I personally don't do this as a habit, but many do.

[magicogar]

I'm using Delta's resin and products and cured it using the 12volt cure lamp for 8 min. It was at nighttime and I just remembered the windshield was pretty cold and forgot about the temperature.

[Repair1]

I would recommend curing under pressure all resin shrinks and it does make a difference when cured under pressure. I do believe there was a small bit in the last AGRR magazine???

Also if your doing them at night under artificial light it makes it real tuff to really see just what is done and what

[dgarza]

yes I have been doing a lot of jobs at night and I have a problem knowing when the cracks are filled because without sunlight its hard to tell.

[magicogar]

I used a flashlight to inspect the crack but I know you need to really have lights shining at all angles to really tell if the crack is filled. What I'm afraid of is when shining a flashlight on the crack, does it have enough UV to cure the resin?

[dgarza]

yes I have been using a flashlight too and it is hard to tell if it is done because the light really makes the crack shin with or without resin!

[GlassStarz]

You other option is to get a inspection mirrors that suctions onto the inside of the glass shine the flashligt on the break you should be able to see if its filled in the mirror? just an idea havnt done it myself

[dgarza]

what would really be good is some kind of light that we could shine on the cracks that would make the resin glow a certain color. that way we could tell if the resin had reached the ends of the cracks on these night jobs.

[CPR]

I use a battery powerer spot/search light you know the kind that you can see for 3 blocks, works for me.