Hi,
6 months ago I discovered small amounts of rust underneath my rubber seals on the doors. It's not a big problem at all but I wanted to squash it early.

Pulled the seals off and treated the rust with POR's 'Metal Ready' and then coated with POR paint. Had a look today and noticed the rust was still active and beginning to bubble under the POR15 paint.

What could I have done wrong? I've used this paint many times before but haven't had a problem with it returning.

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1995 E300 Diesel