I had an unfortunate event occur when picking up my Lancair IV-P from the paint shop.  I was alarmed to find about 20 cracks mostly on the inferior border of the door window.  No visible cracks were present when I took the airplane to the shop.   The cracks run 1/4" from the window edge (see photo).  There were no cracks around the bolts holding the forward hinge and no cracking noted on any other windows.  

 

My IV-P has not been pressurized yet.  I do not have a fast-build door and the service bulletin regarding the door had been addressed.  No solvents were used during installation, only brushed clean and air dried.  I know the painter sanded and added micro to the window edge before painting.  It is not known if any solvents came in contact with the window while at the paint shop. 

 

I am at a loss as to why this has occurred.  I assume chemicals, but frankly my knowledge regarding acrylic failure is limited.  Does anyone have experience in this field?

 

 

Craig Gainza

IV-P

 

PS  Any tips regarding replacement of the window would also be appreciated.