3M 5200 is the only product I would recommend for sealing small holes like screw holes, especially under the waterline.
As for cleaning the hull of water scum I like Mary Kate's On and Off. FOLLOW DIRECTIONS!! If you use this product make sure you are outside or in a well vented area. For cleaning topside, I like a soap and bleach mixture.
As far as the bimini top, I've had good success simply hitting it with a spray bottle of "Fabuloso" and washing it off with a hose.
Never had to seal it so can't help you there. 
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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.
Last edited by Destroyer; 03-14-2019 at 09:29 PM.
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