Protection First Class offers an inexpensive alternative to rubberized undercoating.  PFC is a rust preventative that remains soft and flexible. PFC creates a self-healing barrier that continues to coat long after water-soluble or solvent-based products have evaporated or worn off.  Another great feature of PFC is that its translucent film is easy to see through and diagnose problems before they happen. Unlike rubberized undercoating, that just masks the problem and allows rust to grow and spread under its surface!  It lasts for up to a year, is easy to remove,  is inexpensive, and is easy to reapply. To apply, first clean the vehicle thoroughly. Then, remove any scaled rust.  Next, shake the PFC liquid thoroughly before filling the spray gun reservoir. Now you are ready to apply an even coat of product to the undercarriage of the vehicle!