Review by Luthier and Instructor Robbert O'Brien on Grain Filler and Instrument Lacquer
In this video, luthier and instructor Robert O’Brien tests two Aqua Coat finishing products:
He demonstrates how each product is applied, explains the workflow, and shows the results on instrument wood. The focus is on achieving a smooth, filled grain surface and a high‑gloss finish suitable for guitars and other fine instruments.
In this demonstration, O’Brien walks viewers through every stage of the finishing process using Aqua Coat’s water‑based High Performance Grain Filler and water-based Instrument Lacquer. He shows:
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How the pore filler behaves during application — how it spreads, levels, and begins to tighten as it dries.
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Drying characteristics — what to expect between coats and how to recognize when the surface is ready for sanding.
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Sanding between coats — the light leveling passes that ensure a flat, uniform surface without cutting through.
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How the lacquer layers build and level — each coat stacking cleanly, forming a smooth, optically clear film.
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The final appearance after proper finishing steps — a fully leveled, polished finish with exceptional clarity.
The completed finish showcases what these products are capable of: an ultra‑high‑gloss, mirror‑grade surface. The grain is completely filled, the film is crystal clear, and the final buff produces a deep, reflective shine with no witness lines, texture, or haze.
This video is designed to help woodworkers and luthiers understand exactly what to expect from Aqua Coat’s water‑based system — from pore filling to final polish — and how to achieve a flawless, professional‑grade finish on instruments and fine furniture.
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