[Public-List] Mast Painting
m_tayau at yahoo.com.au
Mon Oct 19 20:56:13 PDT 2009
I painted the mast about 5 weeks ago on #231 (as yet to be renamed). The previous owner painted over the original anodised finish presumably because the anodising had lifted. It was done without a great deal of care and the paint was flaking off all over the mast.
I looked at various possibilities but settled on stripping the anodising off. After removing all fittings I degreased the mast with a strong detergent and then using a palm sander stripped the mast to bare aluminum (220 grit). Within an hour or two I used a conversion coating made by endura paints. This avoids the acid edge step which I was not so keen on handling. The conversion coat was allowed to dry before priming commenced.
The primer/sealer was applied within 30 mins of drying. I used an expoxy based primer which contained Zinc Chromate. I would have prefered not to use Zinc Chromate however I misunderstood what I was being sold and for various reasons decided to use it. I put on two coats.
The top coat was applied about 14hrs after the primer/sealer was applied. I settled on a two part polyurethane. Again I used two coats. The key to the paint system was to ensure that all the stages were applied within the recommended time frame.
I used a brush for all coats. Accepting that the finish would not be as good as when professionally sprayed. I have seen so many jobs which have not turned out well by people who dont spray regularly. So I was happy to brush.
I am pleased with the results. It cost around $200 to do the job. About 1 months to plan and a day or two to do (usual ratio). The right weather conditions were critical. Temperatures of 20-25 degrees and 4 degrees above dew point at all times. And no wind!
Seemed to me that painting was the simplist solution. I would have liked to leave the finish as it was but after researching I felt that aluminum does need protecting. The initial unsightly finish also inspired the repaint.
Be glad to share more detail for anyone considering painting the mast.
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