I just got an n3 Pup and am completely taking apart the 21 yr old aircraft. When it comes to sandblasting off the rust on the 4130 tail feathers and fuselage, what blasting media is usually used. The tubing is light gauge and I don't want to over do it. Usually articles just day that the frame was blasted but no other details are given. TP tools has a 90 grit round particle abrasive that I thought might be worth looking into rather than glass beads or walnuts which may be too light for a frame. I will be doing it outdoors in the backyard this spring so recycling the abrasive will not be very efficient. Thanks for any input.
We use sand or glass beads. Don't stay in one spot for too long. Just work along and as soon as the paint is gone move on to another area. It takes a while to get all the paint off. Usually I walk away and come back and find more spots I missed. I'm usually around 90-100lbs air. The blaster does not lift sand real well at lower pressures.
Paint the tubing with Randoph epoxy primer or Stits. I use stits process but like the randoph primer better. The stits should be top coated with Aerothane.
If you use Airtech be sure to double the amount of hardener in the fuselage tubing paint or the glue will wrinkle and lift the paint.
Super seam and Poly Tak will lift PPG Concept and Delta off the frame.
HVLP works good for spraying the tubing after blasting. Be careful not to get any skin oil or contamination on the tubing. Paint the same day you blast if you can. Low humidity.
Powder coat does not work very well on old tubing.
Hope this helps Charlie
_________________ "Perfection is finally attained not when there is no longer anything to add but when there is no longer anything to take away." Antoine de Saint Exupery
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