Best 2 part epoxy fairing compound for a fiberglass boat

S

southern_boy75

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Was wondering if anyone had on recommendations on a epoxy fairing compound that they have used for a fiberglass boat below the water line. I honestly need to skim the entire hull as I had to grind of all the spider cracked failed gelcoat. I would like like to get it as slick as possible before paint...
 
adtech is great and should be really good for below the waterline. is this a boat that is being kept for long periods in the water? when a hull bottom is media blasted, most yards fix all the bad areas and blisters with 3m marine blister repair material. its a filler but meant for below the waterline and its rock hard. that has always been the repair material of choice. neither adtech or 3m is meant to repair actual glass cracks though. if the fiberglass itself is cracked fairly deep then that needs to be a structural repair done with glass and resin then you can skim with adtech or 3m. keep in mind you cant paint a hull bottom that stays in the water with regular paint or single stage. you need to roll on a coat of an epoxy barrier coat then antifouling paint. regular poly will blister
 
Jim C said:
adtech is great and should be really good for below the waterline. is this a boat that is being kept for long periods in the water? when a hull bottom is media blasted, most yards fix all the bad areas and blisters with 3m marine blister repair material. its a filler but meant for below the waterline and its rock hard. that has always been the repair material of choice. neither adtech or 3m is meant to repair actual glass cracks though. if the fiberglass itself is cracked fairly deep then that needs to be a structural repair done with glass and resin then you can skim with adtech or 3m. keep in mind you cant paint a hull bottom that stays in the water with regular paint or single stage. you need to roll on a coat of an epoxy barrier coat then antifouling paint. regular poly will blister
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The boat will only be in fresh water for a few months out of the year. I have ordered some Adtech to use as the filler, the glass itself is in good shape except where I took out the air pockets out and the normal pin holes. My biggest thought though is how anything would be superior from going straight to epoxy primer after I fill those areas. Even if I have to epoxy prime, polyester prime (which most would be sanded off anyways), finish below the water line with epoxy and SS above. I could even build epoxy primer only to sand out the low areas from grinding the gelcoat off. I’m just not seeing a great benefit to skimming the entire hull with the Adtech vs epoxy.
 
if the boat is in fresh water even for just a month then you cannot paint the bottom. no SS paint, even awlgrip, is rated for below the waterline. it will eventually get water under the paint and make blisters. doesnt matter if its fresh or salt. if the boat was kept on a trailer and only put in the water for the weekend or maybe 1 week then thats a different story. the rule of thumb so they say is 2 weeks in the water then it must be pulled out for a week so the moisture can come out of the paint. for the filler, honestly you should fill the low areas with the adtech then regelcoat the bottom. you dont ever want any raw glass showing then paint over it.
 
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