I have had a few thoughts about how I am going to prevent corrosion on the exterior of my 4130 steel tubing for the fuselage. I know that after a weld the join can more easily become corroded. So I thought I could probably prevent this by adding some etch primer over each weld, but this may cause problems later when the fabric gets laid and etch primer certainly doesnt stick as well as epoxies. I did find an epoxy primer in an aerosol from Septone, but I'm yet to find out if it is suitable, ie. does the epoxy stick well enough and to make sure it isnt affected by the polyfiber coatings. It sure would be alot more convenient if there was an aerosol epoxy primer that was compatible with the polyfiber process.
After emailing Polyfiber, they said that only 2 part epoxy primers are suitable for undercoats under their covering. This is because it doesnt disolve or degrade when it comes into contact with the polyfiber coatings.
Love to hear your comments or suggestions.
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