Painting the underside of a swim platform?

While I have the boat out (again), I'm contemplating painting the underside of the swim platform. Its looking pretty Sh***y. I'm not sure what type of coating was there originally, but I hit it with a sander today, and a lot of it was loose and flake off, while some of it was well adhered

How To Add A Swim Platform And Ladder To Your Boat

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How To Add A Swim Platform And Ladder To Your Boat

, For use on outboard transoms, One stainless wrap around rail and one underside support rail, reversible, Mounts at 10 degree angle on

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BUILD A SWIMMING RAFT: Download FREE Plans, Materials List, Instructions & Video

Conall's Boat Build: Aft deck and swim platform