The EternaBond OPS-1 EternaPrime spray-on-surface conditioner is made for surfaces that are particularly dirty and can't be cleaned easily. It is also useful for rough and porous surfaces. EternaPrime should be applied when using EternaBond sealant tape in low temperatures. EternaPrime takes the loose particles and forms them into a solid surface so EternaBond sealant tape can stick more easily. EternaPrime is made of a VOC exempt solvent that blends in a mixture of elastomers and resins. It meets the health and environmental safety standards set by the federal government. Common surfaces that usually need treatment from EternaPrime include tar, gravel, mortar, wood or concrete. Do not use EternaPrime on PVC material.