For large holes you can also make 5200 go further and fill easier by mixing in some sawdust. (The coarser the better) Squeeze 5200 into a mixing cup, add no more than 1/3 by volume sawdust. Mix thoroughly so all sawdust is coated with the 5200. Trowel into the hole after coating the inside of the hole with epoxy. Hold in place with plastic wrap and scotch tape until the filler has set up so it doesn't run out. Remove the plastic wrap, cover with the clamshell and you're good to go. 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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