No, General Finishes Milk Paint is premium paint developed for commercial applications and is durable enough to stand up to most wear without top coat.
If increased sheen or maximum durability for high-use areas (cabinets, table tops) is required, GF recommends applying 2-3 coats of GF's High Performance or Enduro professional topcoats.
When working with a white Milk Paint color, GF recommends that you use a wood primer such as General Finishes Stain Blocker beforehand, and seal with General Finishes Enduro White Poly or General Finishes Brushable White Enamel.
General Finishes offers Satin Finishing Wax, High Performance Topcoat in 4 sheens (Flat, Satin, Semi-Gloss and Gloss), Flat Out Flat Topcoat and Glaze Effects to compliment the Milk Paints.
Milk Paint is also a superior exterior-rated finish.