Marine Ultra Proofer will re-establish the original 'as new' waterproof weather barrier of your boat covers, spray hoods, canopies and bimini tops. The recently improved formulation now has the added benefits of UV factor protection and a mould/mildew growth inhibitor to ensure covers look like new for longer. Before applying Marine Ultra Proofer we recommend using Renovo Boat Canvas Cleaner according to the ‘severely soiled’ instructions on the bottle to thoroughly clean your canvas. Marine Ultra Proofer will help to prevent the harmful penetration of everyday dirt into the fibres of new and old canvas boat cover material and help to keep the re-colour provided by Boat Canvas Reviver fresher for even longer.