Zinnser 123 primer is available in oil and water based varieties. I've used both types successfully on plugs and around the house. I've put oil based enamel paint over the water based Zinnser 123 primer and it seems to hold up very well on plugs.
I wouldn't use KILZ or any water based household paint on plugs.
A good marine oil-based primer is Interlux # 279 white undercoat , now called Interlux Pre-Kote. Good stuff. I use it on my wooden boat . It's available from Jamestown Distributors in Rhode Island. They are now on line.
Bill
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