It depends on what your furniture is made from, if it is
melamine which flat pack usually is there is a new paint
for melamine, from BQ but expensive and the undercoat is,
manufactures are aways developing new paints to cover
all sorts of materials do they work ? in my opinion very rarely,melamine was never made for painting, and when I have seen it done it looks awful.and in a short space of time it will peel of after all that effort. If you have pine furniture then it is possible but you would need to sand it all down first remove any varnish,undercoat and top coat.
hope to have been some help.