WHY MASTERCOAT PERMANENT RUST SEALER IS THE BEST

When permanent bridge coatings were first developed, it only came in one color--silver.

This coating was originally developed by Mobay Chemical as a primer for bridges. They developed it with the idea that the moisture cured resin would be completely waterproof and strengthened by moisture. The non-leafing aluminum powder was used to cut off the oxygen. This is what made it a permanent rust sealer. If bare metal or rust cannot get oxygen, it can't continue to rust. This coating system is called The Three Coat Polyurethane System. Two coats of the primer, and a color coat for maximum protection. Our Mastercoat Permanent Rust Sealer has been our biggest seller for almost 30 years now--because it works!

A J2 Oldsmobile by Vintage Cars in Fort Mill, SC. When this car was completed, it had a goregous black paint job and was shown that year at the car show in Hershey, PA. We're very proud of our customers' work!

THE HISTORY OF MOISTURE CURED URETHANES IN THE OLD CAR HOBBY

When Mobay Chemical Company first came out with their bridge primer, it found its way into the antique car hobby. It was sold as a permanent rust sealer and metal filler. After that vendor passed away, another vendor purchased it. Unfortunately, it was not someone who was knowledgable about cars or rust repair, but they certainly knew how to advertise. One day they said "The customers don't want silver--they want black to paint the bottom of their cars with." They claimed that it's the "same stuff, just a different color". This was not true. By removing the metallic flake, it was no longer air tight and therefore the surface would rerust. If you put moisture cured clear on a clean piece of steel, it rusts fairly rapidly. The vendor started selling their newfangled black "rust sealer" and one of their competitors saw this, and decided to imitate it. So now at this point, there are four or five companies selling the black as a permanent solution for rust. Here at Mastercoat, we sell it according to the industry standard--which is two coats of silver (Mastercoat Permanent Rust Sealer) followed by a topcoat (Mastercoat Chassis Black, AG111, or a topcoat of your choosing)--and we still get rid of the pits. The rest of the vendors began selling their black "rust sealer", but in good conscience, we had to stay with the silver. Remember, if it doesn't have aluminum flake, metacious iron oxide, or stainless steel, it's not air tight and will not be stopping rust for any length of time.

Only Mastercoat Permanent Rust Sealer offers a toothy surface for paint to adhere to, is sandable to a feather edge, is sunlight stable, and the others aren't--especially the black coatings. Besides offering the highest salt spray resistance, Mastercoat Permanent Rust Sealer is ideal as a base primer to prevent rust from bleeding through your paint job. In this case, this is a '57 Oldsmobile J2, done by Vintage Cars in Fort Mill, SC. The technique for painting sheet metal is acid wash with a phosphoric acid and zinc metal prep (See Mastercoat Metal Prep & Rust Remover), scuff it with 220 grit paper, apply two coats of Mastercoat Permanent Rust Sealer package strength, and then use an epoxy or urethane sandable primer over it for surfacing and to keep the air tight seal beneath it intact. Now the car can sit for years. All you do later is scuff it up and paint it.