Building on the success of our outstanding high solids primer, Envirolak is proud to add tannin blocking functionality without compromising the high fill, quick dry and excellent sanding you’ve come to love. ELPR170-TB incorporates the tanning blocking additive directly into our Envirothane 170 High Solids Primer or it can be purchased as an additive, ELADD 004, and added on-site as needed for small or custom jobs.