It can be done. The emulsion takes about 1 hour to make with 4 ingredients including distilled water. The final melted emulsion adds up to 2 more ingredients depending on contrast, plus hardener and surfactant. The emulsion keeps for 6 months in the refrigerator if you add Thymol as a preservative. The coatings have kept for weeks.

This is doable by anyone. It uses methods from the 40s.