about a month ago i was looking for creosote, plenty of the substitute stuff about,tried that with engine oil, looked ok for a while .then came across the real stuff totally diffrent (black as tar and really stinks) done one loft with it today turned out really dark but made a cracking job,recon it will take couple of days to dry fully,then i bet you could jet wash it and it would not come off.totally un affected by water have to wash brushes and any on skin with petrol.
i found it a melton melbury livestock market and a real bargain £16 for 5 gallon (well stocked up on the stuff now never know when you can get it again.
will post pic when ive finished all lofts
atb lyndon