The tin top, 12 year old diesl golf failed its mot, all 4 floors (front and rear, both sides) have fist size rot holes around the rubber gromits.

The mot man said as log as it's seam welded I can patch it from inside, I've removed the carpets and sound proofing and made 4 plates up. Im thinking cut all the rot out leave a couple of inches all round, plate it from inside then sickaflex in the cavity underneath to stop moisture getting in.

Id usually replace the hole floor on classic cars, but as this is a nearly worthless daily driver that I want another couple of years out of, is this an ok repair. I will leave the carpets out for the retest.

what do you rekon

Sounds fine to me - but if you can get a joddler / joggler from someone, then the patch will be stronger due to the bend, and there will be less of a gap underneath the car.

Chris

why not weld inside and out, then once mot man has seen it lots of seam sealer?

Oversized patch, weld both sides. (put the bigger side of the patch inside as it's easier to weld that side!).

Phil.

Just weld inside and use seam sealer underneath will do. It's Ok to weld both sides but not needed.

just weld from inside, stops all those nasty burns rather when welding from underneath

or cut to size and butt weld so there's no water traps

it's not that much extra work but for a quick job, i'd weld inside and seam sealer underneath

I got hauled over the coals once when I first started as a motor mech by the Vehicle Inspectorate at a MOT appeal because althought it was clear that the patches (welded only intenally) were secure, they SHOULD have been welded inside AND out. The MOT appeal was however rejected.

Ever since then I always cut panels to the right size and but welded.

but weld its a weld once option, no chance of creating water trap and done correctly a lot neater