Can I use POR chassis black without a coat of regular POR first & get satisfactory results?

Jim

Often, the best place to get answers to Q's like this are directly from the vendor. All of this is right in their FAQ section -


QUESTIONS AND ANSWERS


Q. I've been using POR-15 Rust Preventive Paint for years. Can I use ChassisCoat Black instead and get the same rust protection?

A. No. You can use ChassisCoat Black on bare steel and get rust protection, but nothing like POR-15 Rust Preventive Paint, which penetrates into the pores of the metal and chemically bonds with the surface. Use ChassisCoat Black over POR-15 to get the best possible protection.


Q. Come on now! I've put ChassisCoat Black on bare steel and have gotten a terrific bond. It sure looks as good as a POR-15 coating on bare metal or steel. Isn't is just possible you're only trying to sell me another can of paint?

A. Absolutely not! Side-by-side panels were tested under a variety of conditions, and POR-15 was shown to be clearly superior in preventing oxidation and corrosion. Try it yourself and you'll see. Though ChassisCoat Black will easily out-perform other coatings on bare steel, it's greatest value and best use is as a topcoat over POR-15 Rust Preventive Paint. We don't classify it as a rust-preventive coating except in its use as a non-porous topcoat made to keep moisture from penetrating through it.


Q. How does ChassisCoat Black work over other painted surfaces?

A. Very, very well. There are many occasions when you want corrosion protection over a painted surface where you can't remove the old paint. Just clean that surface with a wax and grease remover, then topcoat with ChassisCoat Black. By the way, other colors (white, gray) will be available in the future.


Q. Is ChassisCoat Black the "perfect" topcoat, or does it have drawbacks I should know about?

A. Unfortunately, nothing is perfect in this world, not even ChassisCoat Black! Like POR-15, it won't come off your hands if you let it dry; it will harden in the can if you leave the lid off and dip your brush directly in the can; it may occasionally have some tiny imperfections in its finish, so we can't call it a perfect cosmetic coating; and finally, it is certainly not inexpensive. It's very difficult to make, and the base resins are very expensive, but we've never let cost stop us from making the best coatings money can buy. ChassisCoat Black is one of those coatings.

OK OK graemlins/clonk.gif :D
Got to read once in awhile.

Jim