S

seagull

Well Known Member
I am replacing my back window with the formed plexiglass one. I am considering using silicone instead of fuel tank sealant. The reason I am thinking of using silicone is cost and ease of cleanup.

Any opinions either way?
 
I used 1/16” self-adhesive neoprene gasket material on the window between the aft edge of the turtle deck and the attachment holes. Just didn’t want to be dealing with adhesive if I ever needed to replace it. Working great now for over 350 hrs. If you can punch neat holes in the gasket, you could go beyond the holes with it too.
 
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Silicone has been known to cause plexiglass to craze. Also it’s pretty much impossible to paint, if that’s a consideration.
 
Bob Y said:
I used 1/16” self-adhesive neoprene gasket material on the window between the aft edge of the window and the attachment holes. Just didn’t want to be dealing with adhesive if I ever needed to replace it. Working great now for over 350 hrs. If you can punch neat holes in the gasket, you could go beyond the holes with it too.
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Now that I think about it, I put the gasket on the turtle deck between the forward edge and the window attachment holes, not on the window itself.
 
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We attached ours with Sikaflex. Looks great, works great, no issues for the past few years since we did it.
 
I'll look next time I get a chance. It was a couple years back. I used the same products that are frequently mentioned here for attaching RV-7/8/9 canopies.
 
Thanks for the suggestions.
Due to time constraints putting the window in I couldn't find Silkaflex in a small quantity fast enough. Aircraft Spruce is close so I got CS3204 and dissected the cartdridge. I ended up mixing 1/2 of it and referigerating the rest. The sealant was squeezed in with a 10cc syringe. A lot of tape was used to protect the paint and window. Even with all the tape there was a bit of sealant cleanup. MEK and Qtips worked well on the painted surfaces to remove the sealant and rubbing alcohol did the removing on the window.
 
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