Bullseye

[GLASSTIME]

finally repaired first practice bullseye! i do have a question. at the likes of a star break, should you be able from certain angles see where the bulleye once was. i know with star breaks sometimes you may be able to see the legs at certain angles ect. Thanks in advance for all comments!

[Brent Deines]

The short answer is yes, most completed bullseye repairs will still be visible if you are looking for it, however customers have often had to ask me to point out the repair to them after completion, especially if they don't remember exactly where to look for it.

You will always be able to see the impact point, and often you will see a faint outline around the edge of the bullseye. The ring around the edge is a pressure ring, sometimes called a flower or daisy, although if it is perfectly round I think pressure ring is a more accurate description. The more pressure you use, and the hotter the glass the more apt you are to see the pressure ring. Personally I am more concerned about getting all the air out than I am about leaving a small visible ring, particularly since I do a lot of repairs at trade shows and in training classes where time is of the essence, so I am often guilty of leaving a ring.

The age of the glass and the age of the break also come into play as older glass or a break that has been open for an extended period of time will be more prone to delamination, which may cause the condition described above. To reduce the chances of getting a pressure ring, do not overheat the glass and use minimal pressure to fill the break. It takes a little longer to complete a repair this way, but depending on how concerned with the pressure ring it may be worth it to you.

Now if you are still seeing black spots in the repair that is another story. That is trapped air that should have been removed. That happens to all of us from time to time, but it should always be your goal to remove all the visible air from the break.

[screenman]

Brent for some reason we see more of the pressure ring effect on practise glass when we repair straight after making the bullseye, I put this down to the shock on the PVB, now as we all know the PVB has a memory so when left for a while returns back to where it started. So now if doing a demonstration we will make the break some time before carrying out the repair.

When I first started in this game and was asked to do a demonstration, which the customer thought was going to be a free repair I would make a bullseye in the windshield of my own car, this shocked and impressed most guys. Also not many got inside the vehicle to see what the repair looked like from inside, if they had they would have seen the slight pressure ring. This of course this allowed me the benefit of demonstrating on a nice clean break.

OK some thought I was a bit soft in the head, but some things never change, and for sure they were talking about me after I had left, you know that loopy guy that made a hole in his own windshield.

I called it inspiration through desperation.

[GLASSTIME]

Ok just to make sure I understand completely apressure ring is caused by
1. To much pressure applied during the pressure cycle.
2 To much pressure applied via bridge assembly, leveling screws ect.



Now as far as blackness being present after a finished repair. I have expirenced this but with a different
Style damage "star break" so anytime regardless of the break if blackness is present it is air?
Q:If air is present and your finished with the repair, is there a way to remove. Even after the repair has been cured?

[sunshine wr]

To much pressure applied during the pressure cycle

[GlassStarz]

Also more likely to happen with hot glass (in the sun) go slow more time less pressure will help keep the nasty ring to a minimum

[Layne]

Time2shine. Admittedly, some will disagree with this. Before curing when I see the black spots, I apply a little heat to the inside of the windshield with a bar-b-que type lighter. Just wave it back and forth across the area for about 5 or 6 passes, then clean the carbon residue off and inspect. If some still remains, repeat the cycle. I have had success with this methodology. (Don't jump on me screenman...lol)