Delaminating glass

[Muriel1972]

Hi all,

First time on this board. I am restoring an old porsche 356 and had a local glass shop sand down my rear quarter windows 1/16" as per the recommendations of a knowledgable restorer. Unfortuantely the glass delaminated in a few sections that will be visible after the window is reassembled.

Can this be fixed, or am I left to find a replacement glass? The glass that was sanded is an original sigla glass so I would like to try and salvage it if possible.

Thanks for any help you can offer,

Jason

[Glasseye]

The only thing I can suggest, is to try and inject repair resin inbetween the interlayers to see if it will fill the voids caused by the delamination. You will need to do this away from natural daylight to avoid premature curing. If this is successful, then allow it to cure and finish it by sealing the edge of the glass with silicon to deter water/moisture getting into the interlayer as this would turn the PVB interlayer white over time.

[chipfix]

If the glass looks milky/hazy (not opaque), then the laminate is damaged,not the glass.
As far as I know there is no way to repair that kind of damage to make it visually unnoticeable.

[Glasseye]

Reading how Jason describes the cause of the delamination i.e. during the grinding of the glass, the PVB interlayer will not have discoloured, but will, if left exposed to humidity. Interested to know why the glass has to be ground down. Looking at a picture of your type of car, the quarter glass is made of flat laminated so obtaining a replacement would not be difficult although obviously it would not be OE.

[Muriel1972]

Thanks for the replies. I had the glass sanded on the advice of a well know restorer. Apparently trying to reassemble these windows after the frames have been rechromed is a bit of a nightmare.

Cutting a new piece might be the best option but i was hoping to preserve the original with the Sigla markings which are oem. Just a small point for a restoration but its a shame to throw out the oem piece which is nla.

Thanks,

Jason

[anchovy]

The logo can be recreated and applied to a new window. Create a mask and then sand blast the logo in place to simulate the acid etched logo. I have seen this done successfully on Sekurit logo's which are more intricate than the Sigla logo.

[DryStar]

The logo can be recreated and applied to a new window. Create a mask and then sand blast the logo in place to simulate the acid etched logo. I have seen this done successfully on Sekurit logo's which are more intricate than the Sigla logo.

Even when etching or sandblasting copy of logo it still won't match up with original DOT stamp located on lower passenger side. Any auctioneer professional will catch that. You should post your needs on glassbytes.com. I'm sure they could help you find what your looking for.