No sanding or prep. Then the second coat I do exactly the same colour inside the non-chalk-typical previous matte paint. Then to finish I do a coat of water based non yellowing wipe on poly as my sealer/apparent coat and pie it on that has a rag like I’m cleaning http://paint-cabinets-charlotte44739.jaiblogs.com/22906649/detailed-notes-on-painting-cheap-cabinets