Anything that says no sanding or no primer is full of crap, dont believe it, to do anything properly you need to sand and prime it.
Trust me i work in the industry and all the time companies are like these sell things saying no primer or sanding is required, its all total lies. To do a proper job you need to sand and plastic prime before top coating - i can tell you that companies doing this seriously pisses me off
the painting industry is full of people using these sorts of products. In most cases theres so such thing as no primer required, especially on such a high wear area like knobs.
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