The thickness of the cement can be easily adjusted by simply leaving the top off the jar for a short period of time (thickening it through evaporation) or adding a small amount of Wapsi Fly Head Cement Thinner. Like all cements that harden by evaporation eventually the cement will start to thicken in the jar as a result of repeated opening and closing of the bottle. When this happens simply add some thinner to bring it back to the desired consistency. This can be done time and time again and as a result this cement can last a very long time on your fly tying bench.
 
1oz Jar