1.  The well-known flaxseed poultice sets very tough, but does not stand water or condensed steam.

2.  Flour and molasses, made by making a stiff composition of the two. This is an excellent lute to have at hand at all times for emergency use, etc.

3.  Stiff paste of flour and strong zinc-chloride solution forms a more impervious lute, and is more permanent as a cement. This is good for most purposes, at ordinary temperature, where it would not be in contact with nitric-acid vapors or condensing steam.

4.   A mixture of dextrine and fine sand makes a good composition, mainly used as core compound.