Agnew’s Water Putty is an excellent filler for patching and levelling wood, plasterboard, cement sheet, concrete, etc. Particularly suitable if you need a hard wearing surface. Agnew’s Water Putty sets hard, adheres permanently and fills to any depth without shrinking or cracking. It can be sawn, drilled and sanded. Agnew’s Water Putty is also ideal for Architectural and Hobby Moulding. Agnew’s Water Putty is not a flexible compound. Use only in an exterior situation if you have ensured that the substrate has a low propensity to expand and contract as the ambient temperature changes and have ensured that the Water Putty is dry and then sealed.