protecting inside of square tubing

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If you had to protect the inside of 3x3 square tube that was 15' long and could not seal the ends up how would you coat it? it would be used as a boat trailer?
Reply:WHY can't the ends be closed up?.....zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:galvanize it. In it is a new build use angle, perhaps.
Reply:galvanize it.
Reply:Boat trailer....... Hmmmmmm by the time It rusted through you probably would sell the Boat....... Lol  Miller Dynasty 350Twenty Six HammersThree Crow BarsBig Rock
Reply:Originally Posted by B_CBoat trailer....... Hmmmmmm by the time It rusted through you probably would sell the Boat....... Lol
Reply:Would be for fresh water use
Reply:Square tube is a poor cjoice for boat trailers. Look at commercially made boat trailers, none use tube, almost all use channel.