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Bottom pain thinning
How far can you stretch bottom paint coverage by thinning?
There were only two cans of paint on my yard invoice for last year when I looked back to see how much to buy this year. That didn't seem like very much but it is supposed to go on quite thin. According to the coverage table on the can, I should need about six cans. I couldn't get the proper thinner so I put it on straight which seemed quite thin and to work very well. I ran out about half way down the second side. I drove back to Portland and bought the last two cans of VC 17 M Extra in the city. Saving half a can for the bottom of the keel and under the hull supports I was able to put the recommended two coats on the keel, rudder, and forward part of the hull where fouling creates the most drag. It will be interesting next fall to see the difference between the single coat and double coated areas. If the yard last year put on just one coat, it is possible that they could have done it with two cans if thinning could stretch it from 75% to full coverage. Is that possible or did they just forget to charge me for a can? Unless the yard forgot to bill me for two cans last year, the boat only had a single coat which might account for the marginal performance. BTW thanks to whoever suggested the nail holes in the lid trick for VC 17 M. Not only did it keep this very volatile paint from skinning up in the roller tray, I was able to keep shaking the can as I went. I poured out just enough each time to wet the roller. Being able to turn the can all the way over when pouring also helped keep the copper distributed. -- Roger Long |
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