Mr. Masking Sol Kai is an emulsion type masking material that uses rubber.
Use the brush attached to the cap to apply it to the areas that need masking. It dries in 20 to 30 minutes and forms a thin film.
After the film is formed, you can peel off any part of it by making cuts in it with a design knife or similar. Since it is water-soluble, if Mr. Masking Sol Kai becomes too thick during use, you can dilute it with a small amount of water.