Thread: gel coat
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  #40  
Old October 24th 19, 04:05 AM posted to rec.aviation.soaring
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Default gel coat
On Wednesday, October 23, 2019 at 1:45:51 PM UTC-7, Charlie Quebec wrote:
I know of several cases where the top layers of glass had to be replaced due to crack propagation. This was only confirmed by dry penetration testing.

What, exactly, is "dry penetration testing?"