What did you use to seal the foam on the rudder tip?

[southwind32]

I essentially did what Eddie did, except I used my finger wetted with IPA and just smoothed the surface. I then used a rotary sander to smooth off the surface (the Hysol is tough stuff) and then did a final fill and seal with an auto body filler. Worked well.

I looked up IPA and this is what I found ..... India pale ale http://www.hopandwine.com/what-does-ipa-stand-for/

Is it best to wet your finger and drink the leftover ??

So..............what is IPA??