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Perfect for forming joints between timber windows and masonry

Our traditional sand mastic is supplied in two parts - traditional sand and oil-driers. Traditional sand mastic is used to form joints between door frames and timber windows and masonry or rendered masonry, it has been used for 200+ years. While our sand mastic hardens slowly, it remains sufficiently flexible for the purpose. It adheres strongly to most surfaces.


How traditional sand mastic is made

Traditional sand mastic is made by roasting sand in a kiln or on a hot plate. It was originally mixed with lead based driers, chalk and oils; however, over the years alternative natural driers have replaced the lead products.

Please be aware that mastic should not be over painted.

For more information, and for application guidance, view our downloadable data sheet

Mastic fillets should be neat 20 – 25mm across the diagonal face. The mastic should not be used to make up damaged arises or defective renders, as these deficiencies should be repaired in a proper fashion before commencing mastic work. Here at Lincolnshire lime we supply stone repair materials and other lime products for repairing renders 

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