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A method for coating a building product in which a coating formulation is provided which includes an hydraulic binder and a quantity of dewatering agent. A slurry is produced from said formulation and applied to the product to be coated. The resultant coating is then dewatered through said product.

A method for coating a building product in which a coating formulation is provided which includes an hydraulic binder and a quantity of dewatering agent. A slurry is produced from said formulation and applied to the product to be coated. The resultant coating is then dewatered through said product. Dewatering can be accomplished with or without vacuum assistance. The method is suitable for producing a composite product which comprises a base structural layer with the coating thereon.

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1. A method for coating a building product comprising: providing a product having a first surface, a second surface, and a body defining a thickness between the first surface and the second surface; providing a coating formulation including a hydraulic binder and a quantity of dewatering agent;

1. A method for coating a building product comprising: providing a product having a first surface, a second surface, and a body defining a thickness between the first surface and the second surface; providing a coating formulation including a hydraulic binder and a quantity of dewatering agent; producing a slurry of said formulation; applying a coating layer of said slurry to the first surface of the product to form a coated product; and dewatering said slurry at least partially through the second surface of said coated product by allowing water to pass through the body of said coated product. 2. A method according to claim 1, wherein the dewatering agent is provided in a sufficient quantity to maintain porosity in the slurry and the product to be coated during dewatering.3. A method according to claim 1, wherein the dewatering agent is a particulate material.4. A method according to claim 1, wherein the dewatering agent is selected from the group consisting of fly ash, alumina trihydrate, silica flour, cenospheres and mixtures thereof.5. A method according to claim 1, wherein the slurry has a water content of up to about 50 wt %.6. A method according to claim 1, further comprising the step of curing the coated product by air curing, steam curing or hydrothermally curing in an autoclave.7. A method according to claim 1, wherein the product to be coated is a cementitious building board or product or gypsum building board.8. A method according to claim 1, wherein the coating layer includes fibres.9. A method according to claim 1, wherein the thickness of the coating layer on the product is between about 0.1 and 10 mm.10. A method according to claim 1, further comprising a sanding step and the thickness of the coating layer after the sanding step is between about 0.05 and 5 mm.11. A method according to claim 1, wherein the hydraulic binder used in the coating is selected from the group consisting of white, grey or pigmented cements, hydraulic limes and mixtures thereof.12. A method according to claim 1, wherein the hydraulic binder used in the coating is selected from the group consisting of Portland cement, blended cements, blast furnace slag, pozzalans, masonry cement, oil well cement, natural cement, alumina cement, expansive cements and mixtures thereof.13. A method according to claim 1, wherein the binder in the formulation is between about 10 and 50 wt % based on total dry ingredients.14. A method according to claim 1, wherein fly ash is the dewatering agent.15. A method according claim 14, wherein the dewatering agent comprises: i) about 10 to 60 wt % of the formulation based on total dry ingredients of a first fly ash component having a particle diameter between 1 and 100 microns; and ii) about 5 to 30 wt % of the formulation based on total dry ingredients of a second fly ash component having a maximum particle size diameter of around 10 microns. 16. A method according to claim 1, wherein the dewatering agent includes a coarse fraction fly ash having a particle size diameter greater than about 100 microns.17. A method according to claim 1, wherein the coating formulation includes additives to improve resultant properties of the coating.18. A method according to claim 1, wherein the formulation includes additives to improve workability and applicability of the slurry to the product to be coated.19. A method according to claim 1, wherein the formulation includes additives to improve the properties of the building product to be coated such that upon dewatering of the coating through the product, the building product is thus treated with said additive.20. A method according to claim 1, wherein dewatering occurs with vacuum assistance.21. A method for coating a building product, comprising: providing a coating formulation including a hydraulic binder and a quantity of dewatering agent; producing a slurry of said formulation; applying a coating layer of said slurry to the product to form a coated pro duct; and applying a vacuum to dewater said slurry through said product by drawing water through the body of said coated product.