I wish I could remember :) I didn't do anything too fancy, just followed the directions on the cans of primer and final color. I may have lightly sanded the tube. Sean On Mon, Jun 13, 2011 at 11:58 PM, Carey Fisher w= rote: > Well a telescope is generally subjected to relatively wide temperature an= d > humidity variations so it sounds like I should experiment with =A0your > approach. =A0Did you do any mechanical processing to the aluminum tube e.= g. > sanding etc? > > Carey Fisher > Chief Technical Officer > New Communications Solutions, LLC > 678-999-3956 > careyfisher@ncsradio.com > > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .