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Old Aug 18, 2010, 08:09 AM
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USA, UT, Orem
Joined Jul 2004
9,910 Posts
I don't use the 3M90 on every plane but I will use it at times. The 3M90m will totally dry while the 3M77 stays sticky and heavier. I let the 3M90 dry overnight. When you spray the 3M90 it looks like you have cottage cheese on the wing. But don't panic.... when you iron it the roughness goes away and it smooths out well.

Don't over drill any of the holes for the linkages in the horns and servo arms, make sure they are tight so there is no slop. I have seen several planes lately where the EZ connector can move in the hole in the horn and the wire is loose in the servo arm because the holes are too big. Repeat after me "Tight Linkages!!!!" It does make a difference.
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