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MG MGB Technical - Glass Polishing

I know this has been discussed before. I did look at the archives. Just wondering if anyone has any experience or recommedations for polishing scratches out of side windows. The B appears to be one of those cars that gets scratched side windows fairly routinly.

Understand that polishing scratches out of a front window is not that good in that is can lead to distortion areas, unsure if that would be as critical for the sides.

Anyone tried the Eastwood glash polishing kit? Any shops that can polish out glass?
BEC Cunha

I have tried the Eastwood kit on the windshield of my Mazda and in my exoerience it's a waste of money. I have small road pits in the shield and application of the Eastwood kit didn't make any noticable difference.

Clifton
Clifton Gordon

Eastwood just came out with a new catalog and on the back outside cover they have a new glass polishing kit. Instead of the rhodium powder it looks like abrasive pads you put on a drill. I ordered one to see if I can clear up my volvo glass headlamps. we'll see. It also has pads for windshield glass included in kit. $50 w/free shipp. If it doesn't work I'm sending it back.
Sam Sullivan

Find a rock guy - Lapidaries do it all the time, know all the tricks. Technology changes, the latest I know of is 3M "pyramidal abrasives" very good, and likely what Eastwood is selling for jacked prices. Next step is diamond abrasives, coming down in price and up in versatility all the time.
FRM
FR Millmore

I have some deep scratches in my windshield where the PDO let the wipers run with no rubber.

From experience I have used jewlers rouge to polish lexan.
I tried it on my MGB with pretty good luck with just a buffing pad on my drill and polishing sticks from Home Depot. Need more rpm's to make it faster.

Got most of it out, I just bought a car polisher that goes to 6000rpms and that should finish it nicely.

Total cost for buffing pad and compounds was $6.00 US
They come in 2-3 small stick assortment. Ultra fine for glass.

Best regards,
Doug
DT Toms

I would be careful with the speed, I read that the buildup of heat can do damage.FWIW
Sam Sullivan

Having ground a telescope mirror years ago, I hope these kits use more than just one grade of abrasive. For polishing tempered Pyrex glass, the final step used powdered rouge to make a paste with water, with successive steps prior to that of ever finer grades of Cerium Oxide. But that was many years ago and I would think that products like Fletcher mentions have superceded this process, altho it would probably still work.

If I were doing this, I would probably be tempted to do the whole windshield glass just to avoid creating swales in the surface. It is rather amazing how quickly glass can be shaped by these compounds (as for optics) and spot fixes might result in lower spots in the surface sufficiently deep enough to create problems for wiper action. Just a thought.
Bob Muenchausen

I think the 3M abrasives are named "Tri-zact" or somesuch.
As Bob says, you can easily make a bad lens out of the glass. You have the choice of doing the smallest possible spot and living with the distortion; or, attempting to remove the entire surface of the windscreen evenly! Bottom line is that if touch-up doesn't do it, replace the screen, unless it is very rare.
FRM
FR Millmore

This thread was discussed between 01/05/2007 and 04/05/2007

MG MGB Technical index

This thread is from the archive. The Live MG MGB Technical BBS is active now.