Either... For correct appearance butyl should be used. I have a friend that is very good with an electric caulk gun and lays a perfect, even bead of urethane. It is hard to tell it's not butyl, other than the gloss. Most guys don't get the butyl even and the results are pretty bad.
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Paul
FAST Automotive -The Pontiac restoration shop, not the fuel injection guys! I had the name first.
My site... needs updated-
www.fastrestorations.com
68 GTO's (RA II, RA I, HO, convert, Pro Street, Racecar, etc.), 2 69 GTO Judges, 70 GTO racecar -10.77 @ 124mph, 68 Tempest survivor, 3 03 Aztecs!
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