Alex
I simply wet sanded my mast and boom by hand. It was about 35 years old and I guess it had never been cleaned so I removed a lot of oxide deposit. Not too worry the mast on a 35 MKII has lots of thickness. I stopped at 320 grit but you could go to 600 if you're really fussy, that may make a little difference but I was happy with what I had after 320 grit. As I understand it you really can't stop freshly sanded aluminium metal from anodizing on its own if oxygen is present in the environment and all that the electrolytic processes do is build up a slightly thicker oxide layer than would build up naturally. After I finished the sanding, the parts looked much brighter and when they dried I applied one coat of Aurora quick shine. It turned out very nice for a half day of work; huge improvement over what I had before the cleaning and I am still quite happy with the job after 6 years of use in a salt air environment. If you want to paint I recommend you use a 2 part polyurethane with the appropriate primer for bare metal. If you wet sand and wash the surfaces thoroughly with a trisodium phosphate solution before painting the paint will bond very well to the clean aluminum. The natural anodizing that results in a surface oxide layer in the first few minutes after sanding the aluminium won't be much thicker after a year, so that is to say the self anodizing process happens very quickly. Dwight Veinot C&C 35 MKII, Alianna Head of St. Margaret's Bay, NS _____ From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Alex Giannelia Sent: July 8, 2013 3:02 PM To: cnc-list@cnc-list.com Subject: Stus-List Paint over Anodized Aluminum Hi My spars were painted and when I stripped the boom and spinnaker pole, I noticed the surfaces were previously anodized and that some of this wore off, so how can I most easily prep them for painting? I checked with the local anodizing shop and he can't do anything over 12' in length, so that is out. Any suggestions? Powder coating? I know Wally did the etch, prime, paint thing a few years ago, and if that is the only way, then so be it.. ALEX GIANNELIA CC 35-II (1974) WILL BE RENAMED ON THE HARD SINCE NOV. 2006 Toronto Ontario _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.2242 / Virus Database: 3204/5973 - Release Date: 07/08/13
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