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Old May 25th 15, 06:37 PM posted to rec.aviation.soaring
Charlie M. (UH & 002 owner/pilot)
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Posts: 1,383

On Monday, May 25, 2015 at 11:00:05 AM UTC-4, firsys wrote:
For year, I used to use mirrorglaze for my canopy,
almost every preflight.

Then it disappeared from local plastics supply.

Bought some online a year or two ago, used with good
Yesterday, I squirted some on the PIK canopy and immediately
started polishing.
To my dismay some patches seemed to polimnerise
and form a hard patch. Continued polishing with
a clean cloth removed some; A water flush did some good
but I was left with a few patches, right in the vision line,
which did not yield.
Anyone know if there is a benign solvent which will remove these?

John firth

I would try a wax 1st, if that does not do it, then a "ClearCoat polish" followed by wax.
Plastic canopies & solvent are not usually used in the same sentence.

PS, if it's just surface issues, then you may have to do a plastic sand/compound/wax system. While there are "aircraft specific" types, the 3M kit for doing automotive plastic headlights should do it.
If it comes with a "clearcoat spray", I would skip that part.