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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.
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