Almost ready to paint. 1970 Dodge dart

Instead of re-skinning a nice hood or trunk. Place it upsidedown on padded horses. Pour it full of "Chassis saver". With help tilt it around to cover all areas under the frame. Then pour it out of the corner back into the can and do the same thing to the trunk lid. Once you treat them with chassis saver they will not rust through in your lifetime.
POR15 is not as good as Chassis Saver I used them both. POR15 only sticks to rust. "Chassis Saver" sticks to everything. "Chassis Saver" is the new product by POR15 after they sold the patent for POR15. Once you open the can and humidity hits it Pot life is approximately 1 month. Also put Saran Wrap on the can before replacing the lid or you will never get it off again.

You can also use a wand on a shlutz gun and spray the underside of the frame. Warning do it outside it does get messy and wear junk cloths and skin protector. it does not wash off your skin. Takes one week to shed it.