We remove grease, sand & strip varnishes down to bare wood for a reason.
There are painters claiming to paint and restore kitchen cabinets using mediocre methods at best to prep. They Use TSP and cheap methods to dull the varnish just enough so the paint will hold as long as you don't scratch or bump them.
Low ball painters charge less money for a reason. It takes time and tools to strip the varnish off deep enough so paint absorbs deep into the wood grain. No-one like sanding varnish, its the nasty, time consuming step of cabinet restoration. If you don't do it well, you will suffer the consequences.
The deeper paint absorbs into wood, the less chance to chip or be as noticeable.
The less varnish removed, the easier paint will chip.
If you don't remove varnish or glaze, the paint will chip to the top level of the varnish, thus, you will see the shiny wood underneath every time. Sanding, Scuffing or De-glazing is extremely important. This is most evident when we paint light colours over dark stained cabinets. When considering a painter to "paint, repaint, restore, refinish" old wood cabinets, make sure you are hiring cabinet painters that take the time to prep. Otherwise... once cabinets are painted badly, they will always be chipping and peeling.
Bad finishing seen below:
There is only one proper way to paint over varnish and that is to sand it off
TSP is a no no in our process.
Cleaners do not work alone, you still need sanders, vacuums, air blasting and manual labour to get the wood ready for paint..
Its all about the prep.