Bio Wall Primer is based on natural and non-toxic ingredients and is suitable for use on all new surfaces such as plasterboard, concrete, fibro-cement, plaster, rammed earth and mudbrick. Bio Wall Primer is a penetrating interior wall paint primer for use with Bio Wall Paint. All Bio products are formulated with a carefully developed list of ingredients combining renewable, natural and low-toxicity ingredients. These include plant oils, minerals, waxes, resins and pigments.