My 2¢...

Some sanding will be required.

Keeping the canopy open vs “closed and covered“ will help minimise the amount of heat in the canopy. This isn’t practical if you plan to grid early and wait some time before launch, but if you leave the hangar and tow down and then get ready to launch moderately quickly, keeping the canopy safely propped open works better. Think about how quickly the cockpit temperature skyrockets when you close the canopy waiting for the towplane to take up slack vs just sitting with the canopy open. Yes, open canopies can be broken so it’s not a perfect solution.