Can you make polyurethane flat with corn starch?

Polyurethane cannot be made flat with cornstarch. Cornstarch is a natural thickening agent that is commonly used in cooking and baking. It can be added to liquids to make them thicker or more viscous. However, it is not a suitable material for flattening or smoothing out polyurethane. Polyurethane is a synthetic plastic material that is often used in coatings, foams, and sealants. It is a durable and versatile material, but it is not compatible with cornstarch.