About Us

At SemDar Sealants, we pride ourselves on being one of Gloucestershire's leading specialists in professional mastic application and we are proud to be a Pride of job award winner. 

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With years of experience and a reputation for excellence, our team deliver high quality sealant solutions for residential, commercial and large scale construction projects.

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Our skilled applicators use the latest tools and techniques to achieve a flawless finish every time. Whether that is sealing a bathroom, kitchen, windows, expansion joints or external facades, we understand that precision matters. 

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That is why we focus on a neat, durable and long lasting result that not only look professional but also protect against leaks, drafts and water damage.