You want to have a look under the rubber that runs around the boot opening that the boot lid seals against, this is where our VC SL is rusting, I think if I was to pull off the rubber seal
that in some spots it would break away the vertical lip that the rubber locates on. I have treated ours the best I can and siliconed it up but it will eventually either have to be scrapped or a major panel job done. The rest of our VC is in pretty good order apart from that boot lip area. I have been tossing up whether to sell it to some one to restore or just keep using it till it dies.