This product is cutting edge technology and is 100% solids. That means that there are no fillers in the formula. Only active raw materials to prevent corrosion. Creep N' Crawl is absolutely the newest technology in enclosed area cavity and undercarriage protection. It's delayed drying formulation (168 hours) allows it to creep and migrate into every possible area before turning into a flexible wax film. Most applications are “dry to the touch” in 72 hours. Unlike solvent-based highly flammable products, Creep N' Crawl has a proprietary "very slow cure" formulation which allows it to migrate fully before curing. With no solvents, the corrosion inhibiting agents are allowed to dry naturally for better bonding. When you “force” corrosion inhibitors to dry with solvents you will get lifting and peeling wherever there is an angle or seem in the metal. This is not the case with Creep N' Crawl. Creep N' Crawl has no solvents or fillers. It is 100% solids which means that every raw material in the formulation is effective as a corrosion inhibitor. It makes the formulation a bit pricey, however, because there are no fillers (solvents, water, etc.) you only need a thin coating, and it goes a long way.. There is nothing to evaporate. so if you spray on 2-3 mil thick, you will be left with exactly what you sprayed on the surface. One coat in the enclosed cavities and you will never need to treat that area again for 5+ years. This compound consists of drying oils and anti-corrosion additives dispersed in a proprietary blend that fully cures in 168 hours (1 week). Dry to the touch in 72 hours. The results are a cured wax-like film that repels water and remains flexible to prevent chipping & cracking. Used in enclosed areas (rockers, doors, etc.) this product will provide protection indefinitely. What does "100% solids" mean ? When a coating is chemically "100% solids", what you pay for is what you'll end up with. But if the product is only 50% solids, then the other 1/2 is "fillers" (water, solvents, thickeners, etc.) is going to evaporate. Fillers are not a bad thing. They are often needed to hold the cost down. Naturally formulas that have no fillers (100% solids) are more expensive but go much farther in coverage because you are using much less. What you spray wet, is what you are left with dry when using a 100% solids formula. If the coating is any less than 100% solids the thickness of the coating will decrease because any additive (solvent, water, etc.) that is not a solid must evaporate during the drying process.