Thanks Tom!
yes with deep scratches they may be impossible to remove, or cause a "pooling" on the area where it was. But on light scratches, you wont notice anything. Very similar to marble floors. With marble floors we always recommend polishing the entire floor, because it is very difficult to match the finish. I dont know how it will work on glass (looking at an angle, looking at corals through the repaired surface.
if I did get this stuff I would do a few test runs on crappy tanks (doh, I just gave away one) and see what the results are.
It wouldn't be cool to remove a scratch but then have a "pool". It also wouldn't be cool for the glass to have a higher polish or lower polish than the rest of the glass. I wouldn't be doing the work, I would use a highly trained technician that does this work on marble floors, granite countertops, etc.
again, just seeing if there is a need for this. I wouldn't be buying this just to help you guys, I would be marketing to existing clients we have!