the intention is to clean Hello Serge
Rust will pit the metal as well as flake. I would bead blast the WAF's to make sure that all the corrosion was removed. I would also sand and reseal the spars, while you have access to them. Also check the bolt holes for fit and the remainder of any rust. Orma Southfield, MI N110LR celebrating 20 years Flying, flying and more flying http://www.kr-2.aviation-mechanics.com/
