When I did the rear arches on the Carledo (2012/13, before the club repair sections were available) I made up my arch repairs, welded them to the cut back wings and then folded them up with a door skinner (for extra tyre clearance) against a generous cushion of Tiger seal, wiping away the excess that had squeezed out once done. 6+ years later the repair is still adhering to the inner arch strongly and the couple of miniscule scabs on one arch are more consistent with a problem in the welded arch repair to wing seam, than in the Tiger Sealed joint. I didn't put any additional rustproofing treatment round the inside of the arch joint.
The car has been in year round use in all weathers since this was done, it doesn't even get washed all that often! (So I'm a Philistine, sue me! I'd rather drive it than polish it!)
MY club GRP front wings and nose panel are also secured with Tiger Seal and self tapping bolts and it has worked well there too. It really IS ferociously sticky stuff!
2 door '73 Toledo with Vauxhall Carlton 2.0 8v engine OWF 797M (The Carledo)
'78 Sprint Auto with Vauxhall Omega 2.2 16v engine EGP 247T (The Dolomega)
'91 Cavalier 2ltr 8v auto
'95 Cavalier 2ltr 16v auto
Spectrum Auto Services, Servicing, Repairs, Electrical, Recomissioning, MOT prep, Trackerjack brake fitting service.
Apprentice served Triumph Specialist for 45 years and home of Maverick Triumph.PM for more info or quotes.