TAF sent a Service Bulletin on 8/18/2019 on replacing rivets in the wing spar and fuselage with stainless steel rivets. I guess the aluminum ones will start to give too much and cause cracking in the paint. Fortunately I haven’t riveted the skins onto the wings yet so at least that part I don’t have to redo, but I will need to drill out and replace all the rivets along the bottom to the main spar in the fuselage.
Service_Bulletin_0014_Rivet_replacement_on_centre_and_wing_spars