What is the best metal prep product to use before painting bare metal? will ospho work? is this paint rated for uv exposure?

If you have not sandblasted, clean with KBS Klean and then etch with RustBlast. That is the proper prep for the longest lasting results.

If you have to get down to bare metal, why not just use a good primer and paint? (like an epoxy primer)

Where are you told that you have to get down to bare metal? Follow instructions, remove loose rust. Clean it, neutralize it, paint it.

Despite what others may lead you to believe, it does not matter how good the rust prevention product is if the surface is not prepared properly. Corrosion and organic contamination will block and inhibit any coating from deeply penetrating and permanently adhering to the surface. Even new metals have protective surface oils applied that will interfere with adhesion. Simply put…the cleaner the surface using KBS Klean, the more effective RustBlast will work and the deeper RustSeal will penetrate into the pores and permanently seal and protect the surface. FOR BEST END RESULTS, apply RustSeal to clean dry bare metals with good porous surface profiles such as tightly rusted, sandblasted, or other abraded surfaces to which RustSeal can "bite" into. Newly sandblasted metal surfaces are the ideal choice for direct RustSeal applications as they require little preparation other than blowing off loose dust. Remember to always wear gloves when handling sandblasted items to avoid contaminating the surface with oily fingerprints. Please note that plastic media, bead or soda-blasted treated surfaces do not provide the adequate amount of abrasion needed for direct RustSeal application and do require Step #2 RustBlast for further metal etching. For all other applications, simply follow the KBS 3-Step System below. Always allow products & surfaces to be painted to adjust to room temperature before beginning. (Optional) Topcoating RustSeal: Please note that RustSeal is not intended for use as a final finish when used where the coated surface will be consistently exposed to sunlight. Repeated or prolonged exposure to direct UV light will cause cosmetic alteration to its color and sheen. RustSeal’s guaranteed rust protective properties, however, will not degrade. In areas not exposed to direct UV light, like the underside of a car, RustSeal will seal as well as serve as a great looking final finish. To protect against unwanted cosmetic changes, topcoat RustSeal with any opaque paint system. Please note that a clear topcoat (like DiamondFinish Clear or KBS MAXX Clear) cannot provide the needed UV protection. Choose the closest color associated RustSeal primer to compliment your topcoat and protect against potential visible surface chips. BlackTop, KBS Top Coater and KBS MAXX are high performance protective coatings like RustSeal and are an ideal topcoat for all UV exposed parts. When BlackTop, KBS Top Coater or KBS MAXX are used as a topcoat over RustSeal, they produce an incredibly tough and professional looking finish. There are three effective ways to topcoat RustSeal (with BlackTop, KBS Top Coater, KBS MAXX or other solid color top coat paints) effectively so that the coatings bond and fuse together. Please choose the one that works for your project. 1) Apply your top coat once the second or final coat of RustSeal is dry-to-the-touch and does not leave a fingerprint (usually 3-6 hours depending on temperature and humidity). 2) Let the second or final coat of RustSeal fully cure (at least 24 hours), scuff the RustSeal with 320 grit, then apply your top coat. 3) Let the second or final coat of RustSeal fully cure (at least 24 hours), dust the RustSeal with Fusion Self-Etching Primer, let the Fusion cure for 30 minutes, then apply your top coat. I hope this helps let me know if you have any other questions

Do you offer this in 1 gal. cans ?

As long as there is no corrosion, yes. Follow the surface preparation and product application instructions and this sealant will work very well for a long time

Brand	KBS Coatings
Color	Galvanized Steel
Finish Type	Gloss
Size	32 Ounce (Pack of 1)
Item Volume	1 Quarts
Special Feature	waterproof
Unit Count	32.0 Ounce
Paint Type	Spray
Surface Recommendation	steel
Item Form	Spray
Included Components	1 Quart of RustSeal Galvanized
Model Name	4415
UPC	818032010306
Global Trade Identification Number	00818032010306
Manufacturer	KBS Coatings
Item Weight	2.9 pounds
Package Dimensions	6.54 x 5.87 x 4.92 inches
Item model number	4415
Is Discontinued By Manufacturer	No
Manufacturer Part Number	4415
Special Features	waterproof

KBS Coatings4415 Galvanized Steel RustSeal - 1 Quart

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