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

Brand	Rust-Oleum
Colour	Brown Primer
Finish Type	Matte
Size	340 g (Pack of 1)
Item Volume	12 Fluid Ounces
Special Feature	Crack Resistant, Fade Resistant, Rust Resistant, UV Resistant, Washable
Net Quantity	340 Grams
Paint Type	Enamel
Specific Uses For Product	Interior/Exterior
Surface Recommendation	Metal
Indoor/Outdoor Usage	Outdoor
Item Form	Aerosol
Is Waterproof	True
Package Information	Tin
Colour Code	Brown Primer
Full Cure Time	2 Hours
Coverage	8-10 SFT
UPC	020066776985
Global Trade Identification Number	00020066776985
Manufacturer	Rust-Oleum
Country of Origin	USA
Item model number	7769830
Product Dimensions	20.96 x 14.61 x 20.96 cm; 362.87 g
ASIN	B000PIKJAS

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