No. General Finishes already adds excellent wetting and flow agents to our Milk Paint. Adding another wetting agent is superfluous, and it may even be harmful to your finish if the formulas don't coordinate.
General Finishes Milk Paint can not be wet distressed after it has dried.
Wood Turner's Finish does not need wet sanding. If feel the need for more sheen, dry polish with Merka Abralon 1500-4000 grit or Micro Mesh 4000-8000.
Check out this mention of General Finishes's Enduro Extender in Family Handyman Magazine, July/August 2013. Thanks for the shout-out, familyhandyman.com.
The answer is no, General Finishes Milk Paint does not require sealing, especially for lower use pieces such as a coffee table.
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.
Our recommendation to fix white cabinets that have yellowed is to do a thorough sanding and precleaning and recoat with the following products: