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If the coating is powdery, you need to prep the surface and remove this oxidation. Give the shed a good scrub down with a stiff bristle broom and soapy water. Then, take a Scotch-Brite 155 x 100mm Heavy Duty Scourer Pad and go over the entire surface. Flush with clean water and wait for it to dry.
Once it's dry, try running your finger over the surface to see if there is still a powdery coating. Continue this process until no powder is left on your fingers.
Do one final wash with sugar soap before flushing it with clean water and waiting for it to dry.
You'll then be able to use White Knight Rust Guard Grey Quick Dry True Bite Primer Paint and then your chosen topcoat.
Remember your personal protective equipment while working, including a dust mask, safety glasses and gloves when scuffing the surface and painting. - MitchellMc
I can confirm that both the primer and topcoat can be applied using a paint sprayer if you wish. I would also recommend getting some drop sheets and masking tape to cover up the areas you don't want covered in overspray. It's always a good idea to also test using the spray gun on some timber offcuts to familiarise yourself with its power and spray settings before starting. - EricL
