Circle Damage?

[zlm_us]

I looked at a windshield today that had about a 2"to 2 1/2" circle. The center of the circle was clear appeared to be damgae free and the impact point was in the ring of the circle. It is located in the center of the windshield about 8 inches from the bottom of the glass. What method would be best to approach the repair ( I know it is hard to say without seeing the repair). Should I just fill it like a chip and let the resin flow around the ring or try repairing it like a crack. Or should I just advise them to replace the glass? I am unsure how old the damge is, I'm guessing at least 3-4 months. I will try to get a picture of it. Thanks

[mrchip]

zimus I believe i know what you are describing.... the ring will probably
have a lot of open pits that will leak when you try to fill.. just use pit
filler first on the whole ring / scrape off / then drill in ring just like you
were doing a chip repair it should fill all around. give it a try

[northidahotim]

I had a repair jsut the other day like the one you're describing. There were four cracks coming of of the impact point in a circle. WEIRD! I've been doing this for about six months and have a hundred or so repairs under my belt and this was new to me. The cracks were 3-4 inches off each side of the impact point. I put my injector on the impact point and the resin would not flow all the way to the end of the cracks. It did reach the end of two fo the cracks so I put my light on it and after curing drilled and ran the other two into my bulls. Then filled. I think it turned out very good. This was on a big commercial truck so it saved the customer some$$$. I did tell them that I could not gaurantee that the fix would last and told them that after damage like that I was just trying to save the windshield. So I undersold the fix. Which makes me sleep better at night. Always try to undersell a nasty fix. That way when you do have a repair that decides it doesn't want to be fixed and runs the next day, next month, or next year, The customer isn't all surprised and mad that " that damned rock chip was fixed. He must've done something wrong" I'll bet that even the veterands on this page have fixes that fail. If I was to repair that damage again I would do it different. I would drill all four legs first. Inject resin in all four, cure and then go to the impact point and finish it off. Any input from the pros in here would be helpful.

[Bois]

Zlm us,
I have repaired similar breaks that you describe. If there is one circle, consider yourself lucky. Usually there's a hit somewhere on the circle. Fill as usual and then, if necessary, treat as a crack and drill.

I've also seen similar breaks where there's concentric circles. These I tend to pass up. The circles are usually connected by a fine crack that's difficult to fill.

I'd like to know what causes these type breaks.

Dale...

[zlm_us]

Thanks for the info I appreaciate the feedback

[Frank EU]

Jeff/ Mat,

I have recently pictured a damage like described above.
It was a 'tennis ball' size. The repair took an hour but came out 'perfect'.
Tell me how it can be published, use PM if you like.
Frank

[Glasseye]

This type of impact damage is usually caused by a large object hitting the screen but it has no sharp edges, therefore you get little impact damage but shockwave cracks which are usually circular.

[SGT]

I had one very similar to this dispatched from Lnyx yesterday. The customer said it was less than the size of quater but when I got there it was like 3.5" in diameter. Typical! It was very odd looking. Something I have never seen. Very similar to a bullseye in appearance but there was only a void on the outter perimeter in the shape of a ring and there was not any impact point to be found. The center 3" of this damage was perfectly fine. It was on a 2005 Toyota Scion TC right in the middle of the windshield.

I used a cotton Q tip to find any surface voids as even the smallest voids will usually snag the cotton. I also tried water to see if it would leave any indication. Since I could not find a any surface damage I declined the repair for saftey concerns. Sometimes it is just not worth the fifty dollars.

[johnnyone]

These breaks are caused by a rock that impacted the glass and forced it inwards not breaking the center but creating round circles or half circles. These can usally be filled by starting at the bottom and drilling holes every inch or more and start filling or uses some crack fill and flex the glass to get it to fill seal then cure....

[toab]

If you are drilling that many holes on the same repair arn't you going to leave alot of blemishes in the finished repair? I find that drilled holes just don't come out 100%.are you guys useing the 1171s or the smaller fg329 size bits.I am playing with both sizes right now.The 1171s seem to be better for poping mini bulls but leave a bigger mark in the finished repair.