Jason, I was curious what you've used this product on, and the PDF states that it is not recommended for use under insulation. You know my project situation, how much prep do I really need to do? I've got surface rust, but no sandblasting or pressure washing option.

Thanks!

I am not sure why there would be a problem, unless these is a chemical reaction to the insulation or micro-motion would be scraping the paint away. With an engine under heat no water is going to remain and if obviously covered by a jacket water has minimal chance getting inside anyways and an active boiler cooled and heated anyways will drive the moisture out.

They will have to explain better that concern who makes the paint.