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Yes, you can use acrylic paint as underpainting. In fact, it is a popular choice among artists. Acrylics are versatile and can be used to create a variety of effects, including a smooth, even base for your painting. You can create an underpainting with acrylics by using a toned ground or a thin wash of color. A toned ground is a transparent mid-value color that covers the white surface and helps to see the values better. A thin acrylic wash is a sketchy and loose layer of color that maps out the composition and the shapes of the subject. You can mix and apply the acrylic paint with flow aid, a medium that dilutes the paint without compromising its integrity. The underpainting serves as a base for the oil painting, and the colors underneath can peek through and add richness and depth to the final work