Chuck, I have used 180 or 220 and sometimes bronze wool depending on the level of crud. I wipe the sanded prop down with paint thinner or acetone depending what is on hand. The acetone will remove more old zinc paint than the thinner.
The MAX props have zerk fittings that force grease out of all the joints so I paint first. One rattle can will put three coats on a 17 x 21 three blade prop, the SS strut and the prop shaft. I put it on thick and it will run so wear old shoes. I sand the zinc paint off the areas that the sacrificial anodes contact the prop and shaft. The zinc paint has doubled anode life for the first year, less so the second as it wears off. Martin Calypso 1970 C&C 43 Seattle ________________________________ From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Chuck S Sent: Monday, January 07, 2013 6:23 PM To: cnc-list@cnc-list.com Subject: Re: Stus-List Prop Mussel Farm Martin, >From this list, I'm convinced the prop and shaft should be painted as you >explained. What grit paper do you use on the prop and shaft? Chuck Resolute 1990 C&C 34R Atlantic City, NJ ________________________________ From: "Martin DeYoung" <mdeyo...@deyoungmfg.com> To: cnc-list@cnc-list.com Sent: Monday, January 7, 2013 2:16:02 PM Subject: Re: Stus-List Prop Mussel Farm Bob, I have used Pettit's Zinc Coat Barnacle Barrier #1792 (locally $16 to $17 per rattle can) for more than 10 years. I have been very satisfied with the results. Here in the Puget Sound area (cold dark salt water) it keeps growth off the prop and shaft for up to two years. One can covers a three bladed MAX prop, the SS strut, and the SS shaft. Calypso stays in the water year round. After about 18 months tiny barnacles will begin to appear. Application is easy. I give the prop, strut, and shaft a light sanding, clean with solvent, then apply several coats with (at >50F) 1 ½ hours drying time between coats. Martin Calypso 1970 C&C 43 Seattle -----Original Message----- From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Robert Abbott Sent: Monday, January 07, 2013 10:55 AM To: cnc-list@cnc-list.com Subject: Stus-List Prop Mussel Farm The topic is back.....last year, in an attempt to inhibit the growth of mussels on the prop and prop shaft, I coated them with lanolin.....was told or read this would help. When the boat was hauled in October, the prop/shaft were completely encased in mussels, again. The growth has a noticeable, negative effect on the performance of the prop later in the season e.g. higher RPM's to attain same cruising speed when motoring. After trying a few so called 'remedies', I am now convinced the only effective way to keep the prop free of marine growth (mussels on mine) is to dive a few times a season and physically remove them. Maybe I need a few pounds of lead, my safety harness on and tethered to the toerail and a few feet of hose the top end tied to the pushpit and me breathing from the bottom end. However, before I comtemplated something like that, there is one more 'remedy' I have heard/read about......it involves coating the prop/shaft with "galvanized zinc spray paint". I have never seen this done and do not know what effect it might have on the bronze prop (shouldn't be negative but I'm not sure). There is never any marine growth on my sacrificial zinc(s). Has anyone heard of this? Anyone with any experience with this paint on props? Bob Abbott AZURA C&C 32 - 84 Halifax, N.S. _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com
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