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Yup, Truck Bed Sealer.

I would put the body onto the pan using several tubes of Contractor-sized silicon caulk, let it set up for a few days and then spray the Bejeezuz out of everything under the car with rubberized truck bed sealer, wait a day and hit it again.  THAT would make it waterproof, at least from below.  I may even re-do mine this Spring, if I can get it onto a lift.  Power wash it one week, hit it with sealer the next.

Jack has the right idea, for sure.  Even if he lives in 40'th-ranked Arkansas.  (At least it's really pretty there.... And I don't get to tell people our taxes are less than theirs very often!)

Gordon Nichols posted:

Yup, Truck Bed Sealer.

I would put the body onto the pan using several tubes of Contractor-sized silicon caulk, let it set up for a few days and then spray the Bejeezuz out of everything under the car with rubberized truck bed sealer, wait a day and hit it again.  THAT would make it waterproof, at least from below.  I may even re-do mine this Spring, if I can get it onto a lift.  Power wash it one week, hit it with sealer the next.

Jack has the right idea, for sure.  Even if he lives in 40'th-ranked Arkansas.  (At least it's really pretty there.... And I don't get to tell people our taxes are less than theirs very often!)

I did this same process when I built Eleanor.

The underside got two full coast of truck bed sealer/liner after a round of silicon in all the joints. Top side got covered in peel n' seal (like dynomat). Top side also got a round of silicon in all the joints.

Once the body was installed, I did another two rounds of silicon in ALL the contact areas for the body and pan. I also used the same sound deadening materials in the inside body...

I still have a few more spots to do, but this thing is going to be solid when I'm done!

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