Re: need to engrave hull ID number on older boat
Is the boat documented? If so, it's required to have the document number permanently affixed to a structural part of the boat. That should do.
Before you get out the engraving tool you might ask the Mex. authorities what they would do about a wooden boat or a metal boat or a custom, one-off boat that doesn't have "factory hull number" molded into the stbd quarter?