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Our recommendation to fix white cabinets that have yellowed is to do a thorough sanding and precleaning and recoat with the following products:

All bright white paint will yellow slightly with time, even without topcoat. You have probably tried to touch up white woodwork in your home after several years and noticed that the new paint is brighter.

But white and light paints can react if clear coated with a waterbased finish; water-based topcoats are reactive and may draw out substances in the wood such as tannins, dyes or unknown substances in existing finishes causing the topcoat to yellow. This is an industry-wide issue and can happen right away, years later or never.

GF recommends that you replace the doors if you want to use a white paint like General Finishes Antique White Milk Paint. Some things are not meant to be and painting charred doors is a recipe for trouble. The charring will bleed through.

Vinyl or paper veneers can be often found on the end returns of lower price-point cabinets. We cannot guarantee that our paints will adhere well to a paper veneer - we have no idea what the actual material is or what adhesives were used to apply the veneer to the surface. The resins and additives in our paints may break down the adhesives used for the veneer.

And Milk Paint does NOT adhere to vinyl.

There is no easy solution to this problem. General Finishes Milk Paint has strong adhesion properties but there are several reasons this finish could fail:

Yes.

MDF

1. Apply Kilz or Bin 123 Primer first. 
2. MDF is not as absorbent as natural wood, so wait 2 days in between coats and before applying top coat.
3. MDF also tends to cast a brown color. If you are using a white paint, apply a coat of SeaGull Grey first to counter the brown, and then apply a couple of coats of white over it, allowing all coats to dry 2 days.

Learn more about how to prep MDF before applying GF Milk Paint.

A primer is your best defense under light-colored paint.

Another technique to avoid the slight color change that sometimes occurs when applying topcoat is to add 10-15% of the paint you are using to your topcoat. This technique layers additional coats of color over your piece as well as providing the protection of a topcoat. If you don't like measuring, just add enough paint until you can see a bit of the hue in the topcoat. This method works with a brush or a spray gun.

To maintain the full-strength protection of the topcoat, DO NOT TINT YOUR FINAL COAT of topcoat.

APPLYING GENERAL FINISHES MILK PAINT TO LAMINATE

IMPORTANT: GF advises extra care and prep when applying any finish over laminate surfaces because they are specifically designed not to mar and therefore they are not very "sand-able", making adherence difficult.