FX Lumber Guard XT: fire retardant coatings for wood: Species like White Wood, SPF, Pine and Doug Fir these species of wood are not rot resistant, if you are using one these species that starts to rot or decay, retreating or maintenance will have to be done, power washing or cleaning the material is required for retreating. A wood sealer or paint of some type should be used to protect the wood from rotting, we recommend using a non wax based wood sealer, waterproofing sealer, stain sealer or paint. Natural rot resistant species of wood are cedar, redwood and oak these species should not require a sealer or top coat unless there is heavy traffic on the material (decking or porch).