The ratio is 1:4 (1kg Smil-o-Hot M-500 to 4 litres of Water). Take water in a container and stir it with a stirrer at 900-rpm. While the stirring is in progress, add Smil-o-Hot M-500 gradually into the vertex of water formed by stirrer. Continue the stirring for 15- 20 minutes and give uniform steam to the vessel till the gum is prepared.
The Smil-o-Bond to water ratio may however, be changed to ensure required viscosity depending on the gsm, quality of paper and single facer or double backer bonding.