A mascara base (primer) creates a structure‑building layer over curled lashes that helps "lock" upward movement. Applied after curling, it can extend lift and prevent midday droop by supporting the curled shape.
Mascara bases are usually sold in small travel to full sizes. Common listings show amounts around 0.21 ounces up to 0.3 fl oz, and some use metric volumes such as 8 milliliters.
Mascara bases prime lashes and commonly add curl retention, length, thickness/volume, and conditioning. Some formulas also help extend the wear time of mascara.
Removal depends on formula: some soften and rinse off with warm water and a foaming cleanser; tubing primers tend to slide off as tubes with gentle rubbing; heavily pigmented or long‑wear primers may require a waterproof makeup remover and a cotton pad.