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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.

MDF (Medium Density Fiberboard) is tricky because there are several grades of MDF and the quality varies.

If you cannot determine the quality of the MDF, play it safe and use best practices. The concern is with the edges and ends. The core of MDF is compressed sawdust, glue and resins so when you apply paint to those areas it soaks right up.

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.

We recommend an oil-based finish such as General Finishes Arm-R-Seal.

Oily woods can be tricky with any topcoat. The high oil content affects the drying process of the finish coats and Padauk has a very high oil content. Sometimes oily woods dry fine and sometimes they take weeks.

No, you cannot. The stain will not absorb due to the high moisture content of green wood and not accept the stain.