On Alfa number 15
AO Platinum Member
Join Date: Dec 2005
Location: United Kingdom
Is that last picture how the bodyshop left it?
That is dreadful.
I would clean it back off to bare metal, apply some zinc based cold galvanising paint ( you an buy it on ebay) then I would use something like Finnegans Underseal with added waxoil.
There are 2 problems with that area on the 156 (as well as various other Alfa's and Fiats)
One is those Semicircular cutouts, the seem to let moisture into the car, as well as allow moisture between the underseal and the metal.
Secondly inside the car under the carpet there is a layer of Bitumen type material stuck to the metal. Except because the floor is corrugated the bitumen only sticks to the high parts of the corrugations. This means water can get in the gaps and sit there.
I think the only real long term solution is to remove this bitumen from inside, cut out the rusty bits and those semi circular cutouts and weld in new metal.
My 156 was also rusty on the inner sills, and on the inner front arches.
Me and my brother spent ages welding it up.
On this pic you can see the bitumen stuff on the floor and the corrugations.
Last edited by symon; 06-05-11 at 19:07.