Rubber Seal Amber Rustproofing, 16oz. RS-530 has a selection of rust inhibiting materials that both coat and penetrate the metal surface and are designed to remain indefinitely. Two special  characteristics about this product are the fact that it coats so thoroughly and will not interfere with spot welds. RS-530 will run down into cracks and crevices while coating the entire panel in the process. It can also be applied in areas where spot welds will be used and not interfere with the weld or produce any hazardous byproducts. RS-530 will dry to a waxy type surface in less than 30 minutes and will not transfer off onto hands or clothing. RS-530 cleans easily with any solvent. This formula will never  become brittle. It remains completely waterproof when cured. RS-530