A Florida contractor has developed a successful technique for underwater cement grouting for the purpose of stopping leaks in the countless miles of seawall which must be maintained for waterfront properties. His method is to use a proprietary accelerating admixture in combination with portland cement and sand to produce an extremely fast setting, dense grout which will not shrink away from the sides of the crack being prepared, or experience the leaching away of cement paste due to the action of the water. The most successful mix has been found to consist of two parts of cement and one part masonry sand, with the accelerating admixture added to the dry ingredients to obtain the desired workability. It is, of course, essential to work with very small quantities. The materials are worked by hand, using rubber gloves for protection, to form a ball about 3 and one-half or 4 inches in diameter. This ball of material is thoroughly kneaded until the heat of hydration indicates that the material is ready to be used. The best results are obtained when the ball of grout has the consistency of a soft putty. When the ball of material is ready for use, it is passed to a man in the water who works it into the cracks being repaired.