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Old 04-20-2017, 06:19 PM   #1
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Default Urethane foam

good evening THT,

i am restoring a 87 256 dusky and trying to get opinions on what density to choose from. i am looking on US Composite website where they sell 2lb to 16lb. the foam will be used to fill empty places under the deck where there will not be fish boxes, around the new gas tank and around the fish boxes that hold will hold the ice. thank you.

http://www.shopmaninc.com/foam.html
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Old 04-20-2017, 07:13 PM   #2
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You buy it by the pound, if using 2 pound density than 1 gallon will fill 4 cubic feet, if you're using 16 pound then 1 gallon will yield one half of a cubic foot... most used 2 pound, a few use 4 (The cost doubles), anything more than that is adding too much weight and costs entirely too much. The higher density forms are used for structural purposes and 2 to 4 pounds is used for flotation and insulation...
Gerald
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Old 04-21-2017, 10:10 AM   #3
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thank you
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Old 04-21-2017, 12:11 PM   #4
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You're welcome
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Old 04-22-2017, 05:22 PM   #5
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May want to read up on foaming in the gas tank. That is generally not recommended as it could lead to accelerated corrosion of an aluminum tank. And poly tanks need room to expand, so that's a no-no too. What material tank do you have?
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Old 04-22-2017, 05:49 PM   #6
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Quote:
Originally Posted by CLM65 View Post
May want to read up on foaming in the gas tank. That is generally not recommended as it could lead to accelerated corrosion of an aluminum tank. And poly tanks need room to expand, so that's a no-no too. What material tank do you have?
my tank is going to be ordered from sunshine tanks. i was going to get it Targuard Epoxied also. what do you think for installation then?
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Old 04-22-2017, 06:22 PM   #7
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I am certainly no expert, but I have read quite a few threads on THT and other forums. There are plenty of opinions, and pros and cons for every method you can think of. The problem with foam (or other potentially absorbent materials) is that if it gets wet, it could hold the water against the aluminum and cause corrosion. Coating the tank prior to foaming would seem like a good solution, but if there is any nick or flaw in the coating, it could lead to accelerated localized corrosion. Many recommend no coating and setting the tank on rubber or pvc strips so that it gets plenty of airflow. I hope someone more knowledgeable chimes in, but if it was me, I would not use foam. Not sure if I would coat or not.
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Old 04-24-2017, 07:57 PM   #8
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Quote:
Originally Posted by polcat1013 View Post
my tank is going to be ordered from sunshine tanks. i was going to get it Targuard Epoxied also. what do you think for installation then?
they use coal tar epoxy .. so foam it in it won't corrode.. this is my sunshine tank , i coal tar coated it myself... sunshine does a much better job than I can
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