I've posted this report before, but here's an update after four years.  Everyone knows that getting acetone on the Legacy's canopy or side windows will damage them.  When I installed the side windows, I had small pieces of scrap plastic (acrylic?) from trimming the windows to size.  Out of curiosity, I dunked one of the scraps in acetone for a minute or two and then set it in a windowsill.  Here's a photo after four years:

 

 

I looked at it closely and could see no evidence of damage.  No crazing, no cracking, nothing, except that the felt pen label had faded. 

 

I want to make it clear that I'm not saying that it's okay to intentionally expose the canopy or side windows to acetone, but if you happen to accidentally splash a drop or two, or if an assistant grabs the wrong rag, it's probably not the end of the world.  My sample has sat in the sun for years, which is a fairly harsh test, but it is not physically stressed.  This may or may not apply to our canopies and side windows.

 

Best,

Dennis

Legacy, flying three years and over 300 hours