B&Q mate it's for repairing roofs , power drill and wire brush to key the step paint Isoflex primer on , which if i remember correctly doesn't dry , then lash a load of the black stuff on and even it out with a throw away roller and leave the steps outside overnight . Mine could have been much better but i didn't know before looking up the spec sheet on the net that the rubber doesn't dry like paint , it reacts to damp and sets so the morning dew works great as it doesn't upset the finish then just hose them down .