For the truth about correct methods in the Marine industry. I suggest contacting ABYC American Boat and Yacht Council. They are THE authority on all things Marine. VERY valuable and supported by technical experts and engineers. A large majority of instructions here and on other posts are many times very incorrect and in some cases dangerous. So, always best to check the industry standard informational source. Their info can really stop a lot of the discussions absent any factual support for methods and procedures.