You can apply Gel Stain to MDF, stained surfaces
General Finishes offers a complete line of oil based, water based and wax products. Application techniques differ between oil based products and water based products.
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.
In addition to this non-permeable surface factor, General Finishes Gel Stain is an oil-based product, and it is more difficult to obtain proper drying characteristics over a dense manufactured surface such as laminate. Gel stains, as all wood stains, were formulated to go over raw wood which has an "open" surface and can absorb some of the stain.
Haze (the technical term is blush) is caused by too many coats applied too quickly. A recoat time of 12 hours is not enough dry time when applying over an EXISTING finish. To remove the blush or haze, you can either wipe the area with a strong solvent, like xylene or lacquer thinner, or you can try sanding out the haze and then reapply the topcoat.
While Gel Stain can be applied over an existing finish, it was originally engineered for raw wood surfaces. We prefer applying the Gel Stain over a slip coat of mineral spirits instead of topcoat as shown in this video, "How to Apply Gel Stain to Raw Wood"
General Finishes is proud and honored to be featured in the August 2015 issue of Woodworker's Journal. Michael Dresdner, a nationally known finishing expert, highlights the advantagous of GF water based products in his article (below
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:
Putty comes in two forms, pre-colored or as a stainable wood filler designed to fill minor imperfection such as nail holes, cracks, and gouges in the wood surface. Putty will display stain a bit differently than wood, so it is not a "perfect" fix, but a good one.
The goal is to get the best possible color match to either the color of the raw wood or the color of your existing finish.