Windshield Repair Forum

How old is the glass? Older windshields are MUCH more likely to do that. Thumb pressure could be a contributing factor, but there is usually another cause (heat, age) that makes the windshield susceptible to it.

Scott P.
We ran into the same problem on a piece of flat lami that was new, it delaminated easily too, also the spring loaded punch we used to make star breaks caused a lot of damage. I found that when we dampened the punch by folding a paper towel like 6 times it made damage closer in resemblance to what you find in the field. The punch was exposing the laminate prior to injection and you couldn't avoid flowering under those circumstances very easily. Pressure enough to fill would nearly always cause some flowering and not enough would not fill the damage entirely so..... I thought you might be practicing on a similar piece of glass Scott M

Oh and to tell if a shield is older look for sign's of whitening around the shade band or edges of the shield. The mfg's claim it won't occur but you can have water migration from the outer edge inward on some shields. They claim it takes 1 year to migrate a 1/4" so you can tell how long the exposure has gone on if you look for this on older vehicles. Whitening = delamination, we've seen vehicles that have damage in for repair that have this and we always tell the potential customer it should be replaced at that point. Scott M