This is a pre-stain, clear wood sealer that enables uniform stain application on soft woods, such as fir, pine, or hemlock. Using this product helps to avoid the appearance of uneven, blotchy staining. This VOC-compliant formula is for Ozone Transport Commission (OTC) states and the South Coast Air Quality Management District. This formula may be open for a longer amount of time before stain must be applied. See product instructions for more information.