I had some surface rust on the top of the cab on my Sierra, so I sanded it all down & put primer on, well surface rust keeps coming back through the primer. Is there anyway I can keep this from happening its really getting annoying.

Thanks,

-Timbo-

primmer is porrus(sp). it has pores all over it which allow water in. what you should do is sand it, prime it, and the get a good surface primer or sealer and that should solve your problem.

Don't ya just hate that.
you should bare metal the area & use a 2PAK primer, most primers let moisture in, then top coat it as soon as you can.
Some 2pak primers can be left in the weather for weeks but I would top coat ASAP. Just be carefull if you use 2 pak coz they can kill ya!

yep.