Waxoyl or similar. The standard  pump type sprayer for Waxoyl isn't  really up to much compared with a compressor driven Shutz gun with lance type attachement (Amazon.Ebay etc -mine was made by Plastic Padding )   Heat the  Waxoyl first- place the cannister in a container of very hot water( NOT heating it over a naked flame unless you like living dangerously- Waxolyl is surprisingly flammable)