What I did was .....
Hello Captain,I've got a '75 Ranger 28. When I bought it, the walls were covered with a cream/beige burlap/heavy weave canvas foam backed kind of cloth which I assume is similar to yours. Different than the foam backed vinyl overhead headliner.Anyway, I've removed both as there was some serious leakage that I had to deal with and all the interior fabrics were a mess.My original intention was to replace them all, and decided to paint the interior as a temporary measure till the leaks etc got fixed.I used a standard kitchen/bathroom semi gloss latex, used maybe half a liter? Was easy to achieve a colour that was almost an identical match to the interior hard surface colours.As far as cleanup of the former foam residue, I tried some acetone, some contact glue remover, and .... I forget the other chemical. However, I achieved the best results with a wire wheel on my cordless drill. (Yes I was fully masked for all the various attempts!) Did not achieve a perfectly flat surface, but then I have shelving units that go in so it's not visually critical and the results were quite acceptable.Bottom line? I'm more than happy with the painting and it's durability.(entering 3rd year now?) Will not re-do the sidewalls with fabric, though eventually intend to redo the overhead liner. Not for insulation value (cored deck so insulation unnecessary)but because I'm tired of scraping my poor old bald head on the hard surface! A word of note here: I've tried to find the foam backed vinyl here in Victoria, but the marine upholsterer tells me he can no longer get that fabric, so I may end up with something quite different. FWIW though, here's a link to some folks in Tampa that do sell the original headliner. http://www.garysupholstery.com/Hope that helps.Cheers,Craig