Quote:
Originally Posted by JohnC
I am rebuilding a 77MA 20 and I want to re-foam the stringers. I assume 4# foam would be the best bet to fill the box stringer but I'm not sure. US Composites has 8# available but I believe that's a but overkill. I believe the stringers will be around 12 cubic feet or less so weight of foam is no big deal; the cost of the foam goes up though.
The rest of the space under the deck will be 2#. I will be cutting as much of the top of the stringers out as is needed to remove the old stuff and then re-glassing.
I would rather ask then assume! Is there a reason to use one foam over the other? Thanks.
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You don't need to cut the tops off. just drill 3 inch holes every few feet and blast it out
with a pressure washer. Messy but fast and you`ll save lots of time glassin`.
I wouldn't foam under the deck unless you use epoxy foam. The stringers will keep a swamped hull afloat.
Be real careful using that foam in this heat. You have about 45 seconds before it kicks now and it takes
about 20 seconds to mix... Go with multiple small batches. Buy some dollar store plastic cups to mix.
You must mix exactly 50/50 so use graduated cups for the measure and pour into dollar store cups.
Walk from your mixing station to the hull whilst stirring quickly like a rabbit.
You can only clean dribbles for about 2 minnows so tape/plastic off areas of danger Will Robinson.
It has tenacious grip after about 2 minnows.
You also have to pour in the shade as hot surfaces will cook the foam and stop the expansion.
Bet they didn't tell you that at US composites...