Seam Sealer Locations On Underside Of Car

[AdamMopar]

I am finishing up prepping the underside of my 69 Charger for a final coat of primer and eventually a spray on bed liner.

On the actual underside of the car, are there any locations that should be seam sealed?  I do have a two piece trunk pan and will be sealing that seam, and I'll seal the seam between the inner and outer wheel housings.  My quarters were bonded along the whole length of the bottom to the wheel housings and trunk extensions so those are sealed.

I was trying to think of anything else that was sealed or I should consider sealing.  The only other thing I was thinking of was the floor plans to frame rails, but I'm not sure if that would provide much benefit.

Thank you.
Adam

[sardillim]

i am also going to going to use spray on bed liner on my under carriage,  I was thinking that the bed liner would be thick enough to also work as a seam sealer,  after thinking it over I have decided to seam seal everything and then bed liner over that.  I am also going to Lizard skin the interior.    Still doing research on seam sealer's  trying to find a spray on PVC sealer

Good Luck

[AdamMopar]

Interesting idea for sure.  I can't think of much on the actual underside that was sealed from the factory, at least with how my car looked prior to media blasting.

There may be a few places I seal.  the bottom side is primed right now, and I plan on putting one coat of epoxy primer on it prior to scuffing it for the spray on bed liner.

Thank you.
Adam

[Mopar Nut]

I was wanting to use spray on bed liner on my under carriage too, glad you asked.

[Dino]

Seam sealer on the underside...no I don't think you want too much of that there.  On the inside yes but if you seal the bottom then moisture can't get out.  I can crawl under my car tonight and see where there's sealer but it won't be much I'm sure.

I know of people who have seam sealed the entire underside, only leaving open the stock drain holes and those cars rotted faster than anything I had ever seen. 

Use a moderate coat of undercoating and a penetrating wax in all the crevices.  That'll keep it healthy the longest.  Driving with an oil leak for an hour or two is actually the best but it's not recommended.   

[AdamMopar]

Well I finished prepping the underside more or less.  I just seam sealed the trunk seam for the 2 piece floor plan.  Hopefully in a couple weeks I will get the underside primed and then it will be ready for the bed liner.

It will be awhile before I get to it.  The car needs to come back off the rotisserie, get all the panels fitted and prepped for paint, then just before I am ready to paint I'll put it back on the rotisserie and coat the underside.

Thanks again for all the replies.

Adam

[six-tee-nine]

I'd be painting all panels apart if I were you. Spray the body on the rotisserie. You can put paint on the underside of the car so the places you dont put bedliner on are painted in the correct new color.
Then put the bedliner on after final spray. So you dont get paint overspray on the bedliner. Looks alot more professional and factory alike.

If you testfit doors, fenders and hood and decklid and check for correct alignment before final blocking than its better to paint these parts separate.

Ok it means alot more work to testfit all the panels but i have had a freshly repainted car wit a pair of donor doors once that would not fit, so its worth the effort.
Bedliner after paint means masking the whole car but it looks so much nicer imo