Yes, there's other products out there, but they want you to wait up to 24 hours before top coating while out Rust Prep is ready to paint in 20-30 minutes!! It's actually 2 products in 1! A very effective rust converter and a excellent metal prep that etches the surface to prepare it for paint, primer or filler! Compatible with all top coats. Stops light to medium rust, but instead of converting it to a black primer, it converts it to a zinc phosphate coating resulting in superior anti-corrosion and welding conductivity. Any body shop that tries it falls in love with it and refuses to change! Available in 2 sizes - 16 OZ and 64 OZ.  Should be coated with primer/sealer preferably within 4-6 hours with 24 hr max. Prevents surface rust for 24 hours. Great for Home, Agriculture, Auto, Marine, Industrial and Highway uses!