Flex Seal Question...

mrotto

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So I used a wire brush attachment on a drill to grind down the bottom of my waste tank and applied Flex Seal to retard further erosion. I was pleasantly surprised that under the extreme vacuum of a waste tank it has held up.

So my question is, when I get a new TM, would you recommend that I apply Flex Seal directly to the smooth surface of the bottom of the waste tank or should I use the wire brush attachment to scratch the surface to make the Flex Seal have more grip?
 

J20770

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Jan 14, 2019
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Nothing will stick to a smooth surface. I would sand it with 600 grit sand paper, wipe it down with lacquer thinner a few times and then coat with a good quality roll on bed liner or por 15.
 
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mrotto

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good suggestion. I have long arms but I can barely reach the bottom of the waste tank with a drill and wire brush attachment. No way could I get down that far to sand it.
 

Anderson

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aluminum tank will last 10-15 years...then corrosion sets in.....

i have the same problem........i may replace it....
or get a welder to rewed the bottom...royal pain......
 

george8585

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I used undercoating that is used for cars when my tank first started to leak from corrosion and it worked for about 1-2 years. I would reseal it about every 6 months but eventually it got too bad to fill in the holes.You got to the clean the bottom as good as possible let it dry for a day and then spray the undercoating on the bottom and then let dry for a couple of days. Pain in the a**. I bought about 4 cans of undercoating and just sprayed it down on the bottom and let it dry. No sanding.

I eventually got tired of that BS and had Jon Don take the tank out. Then I took it to a welding shop and had a new bottom put in. That was about 5 years ago and I have had no problems with it since.
 

J20770

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good suggestion. I have long arms but I can barely reach the bottom of the waste tank with a drill and wire brush attachment. No way could I get down that far to sand it.
An orbital sander duck taped to a piece of pipe, it works. You could also get an extension for the drill.
 
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