Floor pan rust - catch it early if you can!
I have a 3.2 GTV that has just had its 12th Birthday and has covered just under 50k miles. Last year I had it re-sprayed as the original red had gone the usual several shades of purple and in the course of that work the sill covers came off to reveal extensive corrosion to the inner sill on the driver's side....the usual cause, namely, tyre fitters and others jacking up on the sill edge thus mashing it and the D-holes that should allow water vapour to escape.....In all respects the underside of the car had looked absolutely fine up until the strip down. Anyway, I decided this summer to have the under seal removed completely and any rust duly treated. So out came the wheel arch liners, the front suspension was dismantled, the front sub frame was exposed and the thing given a thorough overhaul by Howard and the team at Allitalia in Wrexham (extensive photo archive also supplied which is very helpful) .
Findings - two holes in the rear footwells (one the size of a 50p piece with the other about the size of a business card), areas of surface corrosion to the front suspension turrets and elsewhere. Also a few areas of corrosion to the front sub-frame that have been caught in time but will need further work in due course. These were covered by the protective plates that bolt onto the sub-frame so again on a visual inspection everything looked fine.
The moral of the story - don't be lulled into a false sense of security if the under side of your car looks pristine!