There are a few different types of oil paint, each with its own unique properties. The most common type of oil paint is made from linseed oil, which dries slowly and has a high gloss finish. You can also find oil paints made from other oils like poppyseed or walnut oil, which dry faster and have a matte finish. To thin oil paint, you can use any type of oil – either linseed, poppyseed, or walnut. You can also use water to thin your paint, but be aware that this will change the drying time and the final color of your painting. Experiment on a scrap piece of paper to see how the paint will react before you start your project.