That happens on scratch and shoots where flight controls are not removed for painting. We remove and balance all the flight controls and we don't do scratch and shoots, no way to warranty the work if you do.
Even if you paid yourself $20 an hour by the time you bought the materials to clean, bead blast, Rinse, Prime, Paint, Clean up and reassemble you probably would have more than $300 in parts and labor realistically.
CorrosionX is great for coating the internal metal on a plane. It is easy to apply and will prevent corrosion like the primer. DO IT WELL before you paint or after you paint. It will leave a very fine residue all over the inside metal surfaces when done correctly. http://www.corrosionx.com/
Call Southern Avionics in Fairhope AL.. Ask for Matt H. They have a CNC and powder coating too. They can do a special paint that is laser etched, and when light power is added it all glows like glow in the dark sickers.
Well, Most people that come to our shop want their plane base coat "WHITE" with two color stripes.. with 80% of the plane "WHITE" like the clouds... I think some people might just need to put glasses on... or take off the IFR training Hood.
You Can put some spare plastic in MEK it will soften it and make it like a tar. you can then use a Q-tip to soften the edges of your piece then add some of the melted plastic from the MEK. Let stand for a day and it will harden back. You can then sand and re-contour. if the plastic is...