My DH is very experienced making furniture, toys, from wood. Also fitted two kitchens in our own homes and two for AC. I don't like my current kitchen installed in new builds 12 years ago and suggested a paint job to change the colour. A very big NO from DH. It will not work. You di gave to strip absolutely every bit of vinyl then you have an awful lot if prep on the MDF before you get anywhere near painting. Remember you may have end panels, shelving, plinths, not just doors. If cours you may be happy leaving everything other than doors in original colour. There are companies that will take doors away and spray them for you but think they deal with wooden stuff. New kitchen for me, almost finished design and can't wait for work to start.