POR 15 Advice

POR-15 is supposed to be Painted Over Rust, hence the POR name. It can be painted over bare metal as well. Bare metal needs to be prepped with POR's Metal Ready etcher before coating with POR-15. If you're doing a rotisserie rebuild, sandblasting the whole under side, it would be a great thing to use. Just painting POR-15 over your existing undercoating and underside paint won't buy you much protection. If you just top coat withPOR-15, it is only as good as the layers of paint under it because it doesn't bond directly to the metal.

I painted my engine bay and underbody with POR 15 rust preventative paint. Don't get that sh it on your skin or it'll take weeks to get off (don't ask) I'm very happy with how it came out. I wasn't going for a show quality job, just looking to protect my car. I would clean the area first with something like simple green and wash the area with a spounge, then once its clean and dry, paint it. Heres my bay after cleaning/painting: