What if surface is part rusted, rest painted? With spray can there will be some overspray. Will primer stick to enamel?

Surface rust--It depends on how deep the rust is. If really rusted I would use a wire sanding wheel attach to a drill and grind as must rust away as possible (wear goggles to protect eyes)and then sand... If just surface rust I would use fine grade sand paper to treat area. Clean area as best as you can and spray a few coat of red/black (your color choice of primer) primer on area and let dry. Yea, there will be some overspray but sometimes that can not be helped..... Primer stick to enamel. Yes. It depends on what type of paint is on item you want to spray. I would say yes that primer will stick to enamel. I don't know if companies still made enamel primer, some do and some don't. Read the label on the can. I would sand the area were you want to prime with a fine sandpaper to remove the shine from the enamel paint. Clean area and try a test area to see what happens.............Good luck. JMJ

Will this work on tin? I have a shed with a tin roof and I'd like to preserve it since it's rusting.

Well, I dont want to get your hope up but you can but how long is stays there is another question If the tin is really rusted and in sad shape I suggest you replace it but slightly rusted you may sand it lightly and apply 1 light coats of primer and let it dry completely and then give is a second coat...…..It may last a while but wont last for ever...……..The panel may be rusting from within itself and paint may cure the problem but it may still rust as time goes on.,..... JMJ

Manufacturer	Rust-Oleum
Part number	7769830
Item Weight	363 g
Product Dimensions	20.96 x 14.61 x 20.96 cm; 362.87 g
Item model number	7769830
Size	12 Ounce (Pack of 1)
Color	Flat Rusty Metal Primer
Finish	Satin
Material	solid
Pattern	Standard Spray
Shape	shape
Item Package Quantity	1
Coverage	12 sq ft
Special Features	Rust Resistant
Specific uses	Interior
Included components	1
Batteries Included?	No
Batteries Required?	No

Rust-Oleum 7769830 Stops Rust Spray Paint, 12-Ounce, Flat Rusty Metal Primer

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