I went to a NAPA store to get a qt of Herculiner so I could test it. They won't have any until tomorrow, but they also had some 3M rubberized, spray-on undercoating. I got a can and am testing it on wood. Seems ok so far - only have two coats on. It goes on very thin which is fine by me - as long as it is tough enough to hold up under a drop-in liner. Any thoughts on this product? The sales guy said it would remain soft & flexible, whereas the Herculiner would become very hard. Given my intended use, I think soft & flexible would be better.

I'll begin testing the Herculiner tomorrow.

'01 350 PSD CC 4X4 LARIAT / '00 LAND ROVER DISCO II CCP SRP ACE