[Spits] Rattle-Can Primer?

[David Mayer]

What are everyone's thougths on rattle-can primer on bare metal of a Spit 
while it is waiting for body work and final painting?  I just keep getting 
rust spots on the bare metal that I have already blasted and sanded a couple 
of times.  The humidity is killing me here.

Any recommendations for something that will seal up the metal well and keep 
that from happening?

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