No-Toil Rim Grease is a high viscosity, non-petroleum based compound specially engineered to provide the ultimate in sealing the air gap between the filter rim and flange. Designed to withstand up to 300 degrees F, it remains waterproof and dust-proof, keeping damaging dust and water from being drawn past your filter. Designed to withstand up to 300°F, it remains waterproof and dust-proof, keeping damaging dust and water from being drawn past your filter. Easy to clean and removed in seconds with No-Toil Cleaner. Biodegradable, non-toxic.