Fully Built 225 Slant Six Pricing Question

I used to do fiberglass for WESTERN R.V. fixing the crap that got damaged coming down the line.and if You use a laminate roller which gets rid of the bubbles and after glass I under coated outside on the bottom undercoat on inside.While the undercoat was just about dry. I Put sound proofing on floor inside.I think it will last another 40 years.