4ft hydraulic plate roll

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Frank, the Rust Blast arrived, that was fast.
So I can't flood rinse the truck floor, is putting baking soda on after a sponge wash OK to neutralize the acid? I'm going to try spray application with plastic sheet to keep from drying. The instructions say DO NOT allow surface to dry, with that emphasis. I assume oxygen gets back in, and surface rust occurs.
Sorry for asking you this, as the web site does not have any way to contact them via email or online support.
Thanks.
I went to their main site and did a live chat and have all the answers.