Usage guide

Cuprinol Ultra Tough Wood Hardener is a rapid drying formulation for use in the repair of decayed wood and is ideal for use outdoors and indoors. It strengthens, binds and hardens loose wood fibres, to provide a solid base for filling or overpainting.

Use in conjunction with Cuprinol Ultra Tough Wood Filler, to achieve a long lasting weather resistant repair.

Suitable for exterior and interior wood such as window frames, sills, cladding and doors.

Cut away decayed and very soft wood back to a sound base. Remove all loose material. Allow wet wood to dry thoroughly. For best results and deep penetrating preservation, treat area with Cuprinol Wood Preserver Clear and allow to dry thoroughly. Decant Cuprinol Ultra Tough Wood Hardener into the cap and using a brush, apply Wood Hardener liberally to the repair area and immediate surrounding area with 2-3 coats. Allow to harden for at least 6 hours before applying filler. Lightly sand treated area before painting. Avoid contact of fluid with sensitive surfaces such as paint or plastic.

Reseal can after use. Remove as much product as possible from application equipment before cleaning. For best results use Polycell Brush Cleaner.

Always read the pack instructions carefully before use.