Biohouse Hardwax Oil is a wood stain made from natural oils and waxes. Notably, Biohouse Hardwax Oil is not a surface finish (no plastic resins); it instead penetrates wood. This eliminates blistering, cracking, or peeling. More importantly, refinishing does not require sanding. Biohouse Hardwax Oil is formaldehyde free, and meets GB 18581 VOC emission requirements. Free of heavy metals and safe for use of children's toys, Biohouse Hardwax Oil passes EN-71 tests. Once cured, indoor air quality is unaffected by finished floors and surfaces - a highly notable ecological feature.