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there are two options, a concrete admixture or a paint on sealer. There are four types of admixture, latex is the worst as it does not fill cracks that appear after pouring. a brief showcase of kilz masonry waterproofing paint, an interiorexterior primer that creates a waterproof barrier that stops up to 10psi of water pressure. i mixed the paint into the mortar and making a pretty high slump mix. For those with even less construction knowledge than me - it was soupier that normal. Mortars renders and screeds ready-to-use mortars ready-to-use. Adding latex additive to your mortar is a great way to boost bond strength and increase durability against freezing and thawing. This latex additive for thinset mortar can be used when installing ceramic tile, porcelain tile, brick, and stone on concrete, brick, block, or other masonry surfaces. Fill the gaps in bricks by preparing polymer modified mortar in ratio of 1 part cement & 3-4 parts sand, take sl 10-15 of cement qnty. Water, add to mix of cement & sand as required apply 1st coat with 1 part dr. Kingfisher k-x11 waterproof admixture is a copolymer blend of latex and acrylics. When added to cement mortars, k-x11 dramatically improves the attributes of the mix. It provides water resistance, adhesion, strength and flexibility to both renders and screeds, to help make your building waterproof. This durable, alkali-resistant coating provides excellent waterproofing protection with a slightly textured, decorative finish for all masonry. Clean the surface thoroughly, removing any loose mortar, paint, dirt, dust, grease, oil, form-release agents or algae. M4 mortar is actually just concrete, with one part portland and four parts sand, according to boral. Where as, m1 is just one part hydrated lime and three parts sand (and its the only entirely lime-based mortar, which should be used for repairs on old buildings that have it, precisely because otherwise youll have moisture problems). I speculate that the waterproofness of m1 m4 mortar can be. To use in sand and cement, a mixture of 2 parts pva to 1 part water is general. Pva dries to a colourless finish and will not react with any other surface preparation or finish. Paint the surface with a coat of pva before application of the mortar.