Ghost Bond.. XL..........The latest version created by Professional Hair laboratories..florida ,No toxic or harmful chemicals .No alcohol../ water based . shelf life long time ,liquid should be ...milk white and very runny...... if off white and not runny , very old stock. you must SHAKE bottle really well every time,,VERY important, ,..Silk H/P only put 2 G/B coats ..on scalp,.....(1). ,,,P U. base...use small fine flat brush... or finger tip better ... put 4 thin layers on scalp and 1 Thin coat on Hair piece... .wait until clear and tacky... I ALWAYS use a hair dryer on gentle heat..not close.. to warm glue it makes it more tacky quicker, ... dont heat too much ..when clear and very tacky next stage,,only 13 left...i stop selling FREE POSTAGE