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Polyurethane is used to protect wood as will as giving it a shining coating. For this, I chose Minwax® Helmsman® Spar Urethane (A protective clear finish for interior or exterior wood that is exposed to sunlight, water or temperature changes.) I chose a Semi-Gloss finish after doing plenty of research and testing.
While applying polyurethane one must remember to sand the doors with 220 grit sand paper before every new coat.
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Application tool: Synthetic bristle brush
Dry time: 24 hours
Coats: Two so far, I'll add a third coat next weekend
DIRECTIONS:
1. Surface must be dry and free of paint, wax, grease, polish, old finishes in poor condition or any foreign matter.
2. Sand to obtain a smooth, uniform surface. Remove all dust with a cloth dampened with mineral spirits.
3. If desired, apply stain, such as Minwax® Wood Finish™, to unfinished interior wood surfaces. Follow directions for application instructions and dry times.
4. Stir well before and occasionally during use.
5. Apply a thin coat of HELMSMAN® Spar Urethane using a high quality natural bristle brush. On unfinished wood, apply sufficient material to seal open joints, edges and end-grain.
6. Let dry at least four hours, then sand entire surface lightly with very fin
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7. Apply second coat. If a third coat is desired, repeat Step 6 before applying. Note: For exterior surfaces or for previously unfinished wood, three coats are recommended.
8. After final coat, allow 24 hours before normal use.
Next Episode: "The Last Coat"