Water proofing

[randyrls]

I was browsing the internet and found this video on how to mix silicone and acetone to water proof items. I immediately thought of Foam board.
The trick of making a stirrer from zip ties, a shaft and electric drill is a good one.

I have not tried this, don't know how much weight it would add to a plane.

If this would be better in a different forum. by all means please move it.

 

[Piotrsko]

You'd have to test your materials for melting or other damage because that combo outgasses really weird things

 

[Merv]

... to water proof items....

+1 on testing first. that mix MAY eat the foam.

Most use a clear polyurethane to water proof foam, the same stuff you use to finish wood. I prefer the oil but others have the water based poly with good results. A very light coat is all that is needed.