Combination break after repaired with pic. for evaluation

[BrightFastWSR]

I repaired a combination break(approx. 0.79 inch in diameter) on my practicing windshield. pls. take a look at the photo:



there's still a lot of skeleton exist, why it appeared like this?

Should I drill in advance to repair the combination prevent these skeleton from appearance?

Thank you.

[clearquest]

No need to drill into that type of break. I see the outer ring also, usually due to too much pressure or heat, Skeletin as you call it should not be quite so visible however a crushed bullseye with fracturing of the inner cone can be difficult at times to clear out.

[screenman]

I prefer to work some resin into the middle before applying my bridge, if you understand how a combination works you will understand why I do this. Also there is quite a pressure ring on that repair showing that excess pressure was used on the injection cycle.

[benswindshieldrepair]

Screenman, your insight is always helpful. Would you mind expanding on your technique (I'm assuming what you mean is using a dropper to dab resin in the pit prior to the injector?) and what it is particularly about the combo that this helps? Thanks!

[screenman]

That is correct, just a small amount with a dropper and work it in with a sharp probe. My theory behind this is the the middle of a combination is crushed glass, as soon as we put the injector on even with very slight pressure we are compressing the glass. By using my method I manage to get resin in whilst the centre is nice and open.

[Frank EU]

That is correct, just a small amount with a dropper and work it in with a sharp probe. My theory behind this is the the middle of a combination is crushed glass, as soon as we put the injector on even with very slight pressure we are compressing the glass. By using my method I manage to get resin in whilst the centre is nice and open.

I guess that you're using the UV-Dome to prevent ..... eh?

[screenman]

Thanks for that, I was going to mention UV and premature curing etc. but I thought I might get shot down again.

[benswindshieldrepair]

Thanks screenman!