Paint problems AAARRRRHHHHHHH....

[Charleston]

What are you sealing the plug with? If you are using BLO and Spirits, besure you mix ratio is correct. If rich in BLO drying time increases and absorbtion is reduced.
If BLO/Spirits, how old is the mix? As this sealer gets older it begins to turn to sludge. The sludge will not dry for many days. I make a new mix at the start of each new plug building season.

Once again; If your sealer is right, you ae not allowing enough dry time between prime and paint coats.

[saltydog]

RATTLE CANS---> been there done that you need to let the sealer DRY, Primer DRY, then paint it, it all comes down to wanting to FINNISH your plug TO FAST take you time, I have never used (rustoleum paint)--->I use KRYLON an Waltmart brand paint will work together, use them all the time. ALSO you MUST SHAKE the HELL out of the cans, so they MIX properly. check this one out, went to fast an did not let DRY properly went TO FAST to complete
GOOD LUCK GOOD PLUGGIN

[teaser]

All the advice is good on but salty dog hit the nail on the head, I use rustoleum paint all the time . It's not a matter of moisture it's a matter of trying to rush it between coats, the paint has to dry from the inside out after every coat and it can take longer than you might think. I give my paints 1 day dry time between coats. Also what are you clear coating with? Are you sure it's compatable? After you sand
(220 max) the plug try wiping it down with paint thinner and let the plug dry for about 10 minutes then clear coat and you should be all set. I have 2 air brushes and basically use the rattlecans for 90% of my plugs so I know you're pain ... been there - done that.

Good luck