As an old Wood Tick, I'm always looking for a cheaper way that works, found one for slippery surfaces. I build and haul antique Harleys around the country and was always having problems with tires slipping on the trailer ramp and floor, Some of my friends installed alum diamond plate, pretty floor tiles etc, and promptly dropped some expensive bikes. I painted the floor and ramp with oil based porch & deck enamel then promptly spread some rough sand on the wet paint. Allow the paint to dry then apply a second coat, minus sand. The one trailer I used this process on is 10 years old and it is still non-slip. I see no reason it wouldn't work on a metal surface, just clean the surface first and scuff up the original finish with some emery cloth, no need to tape, no parts removal, just a small paint brush. Good Luck.