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HDowse · 03-12-2022, 01:15 PM

JB Weld as an epoxy adheres initially as a chemical as well as mechanical bond to the metal. If you wait until it is completely dry (24 hours) and sand it with rough sandpaper you’ll get a mechanical bond on your second coat. However, if you apply your first coat and then let the epoxy get tacky enough so your finger doesn’t pull up material when pressed into the epoxy, you can apply a second coat on top of the first and it will chemically bond to the first coat. Let it all dry for 24 hours and see what you get for results. This has worked for me in my boat restoration business for years in making fillets, repair of holes, or laying up fiberglass inside a hull.

03-12-2022, 01:15 PM	#40
HDowse Senior Member Join Date: May 2010 Location: Hancock, New Hampshire Posts: 375	Re: Is my block dead? JB Weld as an epoxy adheres initially as a chemical as well as mechanical bond to the metal. If you wait until it is completely dry (24 hours) and sand it with rough sandpaper you’ll get a mechanical bond on your second coat. However, if you apply your first coat and then let the epoxy get tacky enough so your finger doesn’t pull up material when pressed into the epoxy, you can apply a second coat on top of the first and it will chemically bond to the first coat. Let it all dry for 24 hours and see what you get for results. This has worked for me in my boat restoration business for years in making fillets, repair of holes, or laying up fiberglass inside a hull.