Ultimate Guide to Sealing Butcher Block Countertops: Polyurethane vs. Oil

by Jasmine July 13, 2025

written by Jasmine July 13, 2025

How to Seal a Butcher Block Countertop

Sanding and Cleaning the Butcher Block

Before applying any sealer, it’s crucial to properly prepare the butcher block countertop. Start by removing any large food deposits with a plastic or metal scraper, being careful not to gouge the surface.

Next, sand the countertop in the direction of the grain using an electric oscillating sander. Begin with a coarse 120-grit sanding disc and gradually progress to finer grits (220, 300, 400) for a smooth finish. Sand the edges by hand using a foam sanding block and loose sanding papers.

Clean the surface thoroughly with a tack cloth to remove any dust or debris. Finally, wipe the countertop down with denatured alcohol or paint thinner and a microfiber towel, ensuring proper ventilation and wearing protective gear.

Choosing a Sealer: Polyurethane vs. Oil

The best sealer for butcher block countertops depends on your desired finish and usage. Polyurethane creates a hard, shell-like finish that is highly water-resistant and durable. However, it’s not suitable for cutting directly on the surface and gives a more artificial look.

Oil sealers, such as mineral or tung oil, penetrate the wood, providing a natural-looking, velvety matte finish. They require more frequent reapplication to maintain water resistance but are ideal for countertops that will be used for cutting.

Sealing with Polyurethane

Apply two coats of oil-based polyurethane sealer to the countertop, allowing each coat to dry for four to six hours. Use a synthetic bristle paintbrush to apply the sealer evenly, working rapidly to blend edges. Avoid over-applying and wear a hair covering to prevent hairs from becoming trapped in the finish.

After the final coat, clean the tools with mineral spirits and allow at least six hours before using the countertop.

Sealing with Oil

For oil sealing, apply several thin coats of mineral or tung oil to the countertop using a microfiber cloth. Wipe off any excess oil with a clean towel and allow each coat to dry for about six hours. Lightly scuff the surface with 400-grit sandpaper before applying subsequent coats.

Apply two to six coats of oil, depending on the desired level of protection and the porosity of the wood. Clean up with mineral spirits after each application.

FAQs

What is the best sealer for butcher block countertops?

The best sealer depends on your preferences and usage. Polyurethane provides a durable, water-resistant finish, while oil offers a more natural look and is suitable for cutting surfaces.

Can you permanently seal butcher block countertops?

No, butcher block countertops cannot be permanently sealed. All sealers eventually require reapplication, with oil sealers needing more frequent touch-ups.

How many coats of sealer should I apply to a butcher block countertop?

Apply two coats of polyurethane sealer and two to six coats of oil sealer, depending on the desired level of protection and the porosity of the wood.

Additional Tips

For a more durable finish, consider using a food-safe epoxy resin sealer, which provides excellent protection against water, heat, and scratches.
If you choose to use a cutting board on your sealed butcher block countertop, be sure to place it on a separate surface to avoid damaging the finish.
Regular maintenance is key to preserving the life of your sealed butcher block countertop. Clean it regularly with mild soap and water, and reapply sealer as needed.

Jasmine

Jasmine's journey began with a camera in hand and a heart brimming with stories. The world, for her, wasn't just a collection of sights and sounds; it was a vibrant tapestry woven with intricate details, each one waiting to be captured and explored. This inherent curiosity naturally led her to the written word, where she discovered the power of language to weave narratives that resonated with the soul. Jasmine's articles in LifeScienceArt's life section are a testament to this synergy. Her words dance across the page, painting vivid pictures that transport readers to the heart of the experience. Whether it's the quiet contemplation sparked by a morning sunrise or the electrifying energy of a bustling city street, Jasmine has an uncanny ability to translate the essence of a moment into words that resonate. But Jasmine's talents extend far beyond the written word. With a keen eye for detail and a photographer's soul, she sees the world through a unique lens. Her photographs are more than just snapshots; they're windows into hidden emotions and unspoken narratives. A single image, captured with Jasmine's signature touch, can evoke a kaleidoscope of feelings, prompting introspection and igniting a sense of wonder in the viewer. The way she plays with light and shadow, or the way she finds beauty in the ordinary, speaks volumes about her artistic vision. It's clear that Jasmine doesn't just see the world; she feels it, deeply and passionately. This depth of feeling is evident in her writing as well. Jasmine's articles are infused with a raw honesty that connects with readers on a personal level. She doesn't shy away from exploring the complexities of life, the joys and sorrows, the triumphs and failures that we all experience. But even when tackling difficult topics, there's an underlying optimism in her words, a belief in the inherent resilience of the human spirit. Jasmine's writing encourages readers to embrace the full spectrum of life's experiences, to find beauty in the unexpected, and to navigate the challenges with courage and grace. One gets the sense that Jasmine's own life is a continuous exploration, a constant search for new experiences and perspectives. Whether it's venturing off the beaten path to capture a hidden gem through her lens or delving into the depths of human emotion through her writing, Jasmine thrives on the journey itself. This inherent sense of adventure is infectious, inspiring readers to embark on their own explorations, both internal and external. Jasmine's work isn't just about capturing moments; it's about igniting a spark of curiosity and a desire to live life to the fullest. Perhaps the most captivating aspect of Jasmine's work is the sense of intimacy it evokes. Reading her articles feels like having a conversation with a close friend, someone who understands the nuances of life and isn't afraid to share their vulnerabilities. This ability to connect with readers on a personal level is what makes Jasmine's writing so powerful and enduring. It's a testament to her own authenticity and her genuine desire to connect with others through the magic of words and images.