Damp proofing

Has anyone any experience of using a product from a company called Dryzone for damproofing brickwork. Its a cream thats injected into holes drilled in the mortar bed. Injection is by means of simple hand operated gun like silicon sealant guns and its easy to see when sufficient cream is in place.. The company claims that the waterproof bit of the injection seeps gradually along the mortar bed and seals it against damp. It appears a lot easier to use for the DIY man than the usual silicone based fluids which need fairly high pressures and drilling of brick faces, and are messy. Employees of Dryzone do not need to reply.
Regards Dave
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