8-550 Hs420 Speed Clear Hardener

8-550 HS420 Speed Clear Hardener is a high-quality polyurethane hardener formulated for the WaterBase 900+ Series. It delivers a clear, durable cure that increases surface hardness when mixed and applied according to WaterBase 900+ technical guidelines. Use as the recommended hardener with WaterBase 900+ topcoats to improve finish durability and achieve consistent curing performance.