I have application marks in my finish

Lap marks may be caused by: - Porosity of the timber. - Application in hot weather or in direct sunlight. - Over working the coating (brushing the product too much in one area). - Strong draught in an area. Sometimes application of another coat solves the problem. If this does not work, then the only option is to remove the coating entirely and start again. The coating can be removed either by sanding or using a paint stripper.