Two tubes will probably do it
If your fit is pretty good, between 1/8 and 1/4 inch gap at all contact points, two tubes will just do it. The tubes are not very expensive, it's the primer that really costs the most and one can would probably do three airplanes.
I used a bit over 2 tubes on my 7 slider because of large gap at the windscreen to roll bar (but the overall fit is excellent).
YMMV
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Hangared since 11/23/2011, working on getting airborne again!
Joe Portman
N131RV - RV-7A, IO360A1B6, CS
Rebuilt as TD
Added dual MGL EFIS.
Airborne again at last! 2/21/2009
Elmendorf, TX (28TE)
baron (AT) baron (dot) com
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