Quick Tip: Thin Your First Coat

Thinning your first coat of varnish or polyurethane creates a better foundation and helps subsequent coats adhere properly. This technique improves durability and appearance.

The Ratio

Mix approximately one part mineral spirits to three parts oil-based finish. For water-based products, use water in similar proportions. This thinner consistency penetrates the wood grain.

Why It Works

A thinned first coat soaks into the wood fibers rather than sitting on top. This creates mechanical adhesion. Full-strength coats applied over this foundation bond more effectively.

Application Method

Apply the thinned coat with a brush or rag. Wipe off any excess after a few minutes. Let it dry completely before applying full-strength coats on top.

Many professionals call this a sealer coat. It takes minimal extra time but noticeably improves finish longevity.