"Does what it says on the tin. This is a trusted waterproofing product used in the building industry for many years. Rain droplets can be seen on the surface of the brickwork and not penetrating it. Have only given 4 stars for value as I've seen this product £2 cheaper elsewhere but not at the time of purchase in my location."
"This stuff worked brilliantly. We applied it to Western Red Cedar using a garden sprayer, then brushing it out for an even application. It stopped the Cedar acting like a sponge (it just sucks up moisture, particularly at joints where the water moves in fast by capillary action) and now rain beads on it before running off harmlessly. The best thing? The appearance of the wood didn't change appreciably, so the customer was very happy - she had refused coatings before because she liked the natural beauty of the wood. This stuff even (apparently, though we haven't seen it happen yet) allows the wood to go grey naturally, which is much better than staining if you are happy for it to weather normally."
"We use this on our timber outbuildings once a year. One coat sprayed to saturate the wood. Full water repellency doesn't last a whole year but WaterSeal does maintain the condition of the timber, allowing it to turn a natural grey colour over time, which fits into the countryside far more sympathetically than the usual black/brown/green/orange timber preservatives."
"Being water based this has low odour and is easy to clean up. However on some surfaces it can be harder to apply compared to the old solvent based formulation.
With porous materials like concrete, brick and mortar is it quite easy to apply this water sealer as it just soaks in. However when trying to apply it to vertical wooden surfaces you'll find it will run off before soaking in resulting in huge wastage. This is because wood has some natural oils and is less porous.
On wood the trick is not to use a brush but to spray on a light layer with a relatively fine spray. The droplets will cling onto the wood long enough for it to soak in. Once the first coat has soaked in the second coat is easier to apply.
Another thing to note with the water based formulation is that you will not be able apply more coats once it has dried as it will repel itself."
"I've used this stuff for the first time in the last week. It certainly makes the masonry water-repellant - there's been heavy rain since, and the water visibly ran off the brickwork and mortar, which was pretty porous before. How long it stays effective remains to be seen. I previously (10 years ago) used a solvent-based waterproofer, which over time became ineffective. The fact that this one is water-based means that it's much more user-friendly to apply."