Xllund, F/C includes a solvent to make it soak into rod guide threads better. I'm thinking you're getting a chemical mis-match between the F/C and your sealer or primer. There's no easy way to predict if a reaction will happen between coatings, especially ones that contain solvents. That's why there are "families" of compatible coatings developed by companies. You just have to experiment. IMO, if you avoid solvent based coatings when possible, you have fewer problems. For example, try plain epoxy, epoxy thinned with acetone, or a water based sealer. For primer, try plain white acrylic latex. As long as your topcoat is strong, what's underneath is unimportant as long as it sticks in place. The only time I use solvent primer or sealer is on oily wood like cedar. Avoiding solvents also makes your tackle box smell much better