Hi,

I have used micro mesh kits in the past, not on the glider canopy but on big airliner window panels. It's still acrylic so It should worki the same. Micro mesh is great for final polishing but to remove the scratches you usually need to use much more rough wet or dry (sand paper). Sometimes I was starting with grade 150, but that was only in extreme cases, something like 600 should be sufficient in most cases and of course a lot of water. It's hard to suggest what grade you should use without seeing the canopy but as I said you need to remove a bit of material first to remove scratches and then go with the kit to restore transparency. Just bear in mind that doing so may and will create some distortions so if the scratches are somewhere right in front of your eyes and they are not so deep I'd be very carefull with removing them as it may be worse to look at distorted canopy then at some minor scratches.

brgds
Piotr