Hi guys, is it common practice to underseal your cars?

Theres nothing under there to seal

Seriously, chassis is powder coated/painted and floor pan is aluminium.

Underseal is a bugger to work through as well if you ever need to.

Noooooooo

Underseal is orrible stuff, havent even undersealed my mgb:
Rescued attachment underpainted.jpg

not everyone has an ally floor, i have steel, and have undersealed my previous car and will do this one too, i used some lightweight stuff from worth, worked well, no harm in having that bit of extra protection!

I have a steel floor. Its not seam welded all the way round, so moisture / water can get in between the floor and the chassis rails. That will eventually cause rust, as the floor was welded in before powder coating. Hence there is almost certainly bare metal between the floor and the chassis. I have put a coat of underseal all they way around where two bits of metal come together to prevent water getting between the bits of the chassis / floor.
However, I have not coated the entire floor and chassis rails. Only where they meet up and water can get in.

Also did the lower rails where the central tunnel meets up. This it stop water getting into the cab area. Again, just the joins were sealed.

didn't underseal my westy but did paint the alloy floor etc with smootherite black to protect from roadsalt etc.

i did however underseal the inner arches and underside fibreglass so it reduces the damage from stone chips etc.

cheers guys I think I'll avoid it. With no wet weather gear I wont be taking out in the rain anyway..

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With no wet weather gear I wont be taking out in the rain anyway..

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I used some rubbery underseal under the front and rear arches. Stops the stones flicked up by the tyres chipping the GRP.