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Use a pump up sprayer to drown the barnacles with muriatic acid if that is what you decide to use, you will see the chemical reaction with the calcium, it will start foaming, as soon as it stops blast it off with a high pressure sprayer and start over again.Just be careful using anything with a metal blade to keep from gouging. When we finished we had a clean dull bottom, if you intend to hand sand with 4-6-or 1000, you will be an old fossil before you finish. Just use extreme caution, you are going to be under the bottom scraping this stuff off and it will be all over you.

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15y ago
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Q: Can muriatic acid be used to remove barnacles from a boat motor?
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