The instructions on the can are not the best Dave, did you treat it like nitromoors and try stripping it after a couple of hours? I have found it is best left for about 5 days this time of year, if you want to extend the life of it you can daub it on the hull and cover with cheap clingfilm, this means you can peel a bit of the film back and try scraping, if it comes off with one scrape it is ready to be stripped if not cover with the film again. This way you can pick your time to strip the softened pain as the solvent in the dilunet does not evapourate through the clingfilm. It will come off with a pressure wash if you have all over protection for yourself including an air supply but not recomended unless you have the right protective gear. It is good stuff but you have to be patient with it.