Foam filled pontoons...

Capt Ron

Petty Officer 2nd Class
Joined
Apr 2, 2001
Messages
142
My girlfriend got a dirt cheap deal on a 28' pontoon, Merc 65hp motor, and trailer. I checked it out for her and have already got the motor running great for less than $50. (I'm an ex-marine (Mercruiser certified)mechanic). The trailer is in good condition and I towed the rig 40 miles home. The pontoons however are going to need some work and have a couple of holes from damage at the sterns. Welding aluminum is no problem but I find now that the right (starboard) pontoon is heavier than the left (port) and they are filled with the white styrofoam used in cheap coolers and coffee cups which is breaking down into the little white balls. This foam is saturated and therefore adding the extra weight. I know that I may have to cut holes in the sides of the pontoons to remove the foam and thinking about using a 4" hole saw at the top outside. <br />The pontoons are of the canoe type with the flat top deck riveted on and the cross members riveted on both inside and outside. I would hate to have to remove the entire decking, cross members, and rivets to remove the pontoon tops. I have no idea of the location of any baffles except the forward bow. Someone suggested melting the foam with gasoline, I nominated him for the Darwin Award for this year. Is there another non-flamable way to remove the foam? I'm thinking along the lines of scooping out as much possible and then using a pressure washer to blast out the rest which should flow out of the 4" hole. Also when I get ready to put it all back together I would like to use an expandable foam in the pontoons before welding the 4" cut-outs back in. I want to keep the level of the foam lower than the weld points. How much pressure can this foam exert in a confined area? Which would be the best type to use?<br />Should I get a new girlfriend?<br />Thanks <br />Capt Ron
 

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: Foam filled pontoons...

Keep the girlfriend, Ron. Girls with boats are too hard to find. Restorng the pontoons should be a snap by comparison.
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<br /><br />That much expandable foam is very hard to install safely. It can generate enough pressure to distort or rupture the pontoon. Find someone who is skilled at installing expandable foam for home insulation and get them to do it. It will probably take a half dozen or more holes in the top deck to do it safely. Your ideas on how to get the old, waterlogged foam out sound better than any I can come up with. What is in there is probably polystyrene which is cheap but fragile. The polyurethane or urea-fomaldehyde that are used for insulation are much tougher. Get them to use polyurethane, which is closed-cell so it cannot absorb water.<br /><br />Does your girlfriend have a sister who is a boat nut?
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<br /><br />Good Luck!<br />JB
 

Capt Ron

Petty Officer 2nd Class
Joined
Apr 2, 2001
Messages
142
Re: Foam filled pontoons...

Her sisters are just nuts. I have decided to cut the stern panels off at the seam and then see if I can scoop this stuff out. I was going to replace these panels at a later date anyway. Besides I have a feeling that there may be mud in there also. If I can get all the way to the bow then I can get them cleaned out pretty good. With a bright light placed inside the length of the pontoon on a dark night I should be able to find other pin holes for repair.
 

Ohioangler

Cadet
Joined
Sep 15, 2003
Messages
12
Re: Foam filled pontoons...

That sound great<br /><br />Let us know how it turns out<br /><br />Tams
 
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