cyntax pmb 500 : polymer modified bitumen waterproofing membrane ● cyntax pmb 500 is a single component, liquid applied, polymer modified bitumen emulsion. It is coal tar free, moisture cured elastomeric waterproofing membrane. It is full flexible, very high water beading (water repellency) effect, can be applied on dry as well as wet/damp/moist surfaces. usage : it is high performance waterproofing membrane basically used for under laying protection to basement and roof top.