Floating Pirate

Thank you for all your ideas some of which made me laugh. I will let you know what works well once the job is done. Cheers Floating Pirate

Hi I have a roof with four squares of non slip "grit" which does a great job. I am looking to repaint these squares as they need a freshen up and I am wondering what paint to use to give a good result? The grit has not been painted since new (5 years) and has a good "tread" on it. Dark grey would be nice if available. Also in a small number of places on these squares where rust blebs are showing, how is it best to deal with these, for example I could dig the area out, sand down, treat with rust preventer etc but how do I restore the gritted effect? Many thanks for any help.