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Synthaproof is the most commonly used bitumen damp proof membrane used in the building trade and is available from any builders merchant.

Strangely for a waterproof material, it's water based - and horrible stuff to use if you don't wear old gloves. With a bucket of Synthaproof, a bucket of water and a coconut brush, you brush the stuff onto the floor or wall, keeping it alive by dipping the brush into the water. Any splashes onto the skin make them black and waterproof for a considerable time - hence the old gloves.

As soon as it's dry, it forms a skin of permanently waterproof bitumen. The idea of the render is to form a protective barrier against knocks and sharp objects. This is the same method you would use if you wanted to damp proof a cellar.


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