17 replies to this topic

[sonikk4]

The Bilt Hammer cavity treatment comes with a long plastic tube with holes in so that when you spray it covers 360 degrees. Haven't used mine yet as I am still welding up, but will be drilling holes from the wheel arch into the inner sills (it's a Saab not a Mini) then plugging the hole with a rubber grommet - these are about £4 for a box with loads in from eBay.

I was a bit concerned about drilling holes but the alternative is leaving areas unprotected. Although I used weld through metal primer on the inside of the metal I replaced, it's inevitable that there will be bits unprotected and the BH stuff should help.

 

Make sure each hole you drill is touched up afterwards before you insert the grommet. Before i joined the RAF in 1980 i worked for a company called Rust Protection and this is how they did all of their holes except they used a bitumen based paste to touch the holes up. 

[Carlos W]

Thanks to this thread I've just remembered I need to do the A, B and C pillars before the roof lining goes in

[castafiore]

"Make sure each hole you drill is touched up afterwards before you insert the grommet. Before i joined the RAF in 1980 i worked for a company called Rust Protection and this is how they did all of their holes except they used a bitumen based paste to touch the holes up."

Will do, Sonikk. What I was in two minds about was whether to, in effect, glue the rubber grommet in place with Tiger Seal. If not, it might fall out and allow water ingress, but if I do Tiger Seal it, it will be tricky to get out if I ever want to redo it. There was a hole and grommet before, unsealed.