The Technical Data sheets for every product you want to use are on the internet. I am not trying to be a smart ****... but every product on the market publishes their technical advise to avoid failures. My recommendation is read them a couple of times, fully understand them before using them. If you are still not sure, contact the manufacturer with your concerns. They want you to have a successful result.
Having said that, bare steel with a "tooth" for body filler to adhere to is a good thing. 80 grit seems pretty coarse, but again, the TDS will advise.
You didn't ask, but I will mention anyway... "tightly adhered" coatings do NOT need to be removed. Painting over existing, tightly adhered coatings is perfectly acceptable. No need to remove all the coatings to prime and paint.
Last edited by FootStomper; Sat Aug 05 2017 03:04 AM.