Texston TexPrep Primer is a superb white-based, penetrating sealer primer that will equalize the substrate suction. It is tintable, odorless, and specifically formulated for the application of plasters, Texston Primer is a 100% acrylic, water-based interior and exterior primer/undercoat with ceramic spheres that create mechanical grip. This product may be used on new or old surfaces and is suitable for residential and commercial applications. TexPrep Primer is recommended for application over absorbent surfaces such as wallboard, brown coat and EIFS cement base coat.