CA comes in different viscosities so it can be used for a variety of applications. All Mercury products have the scientific viscosities rating right in the name. The thin (M5T) CA is 5 cps (cps stands for centipoises which is a scientific measurement for viscosity. 1 cps would be equivalent to water, which is a very fast wicking grade CA. To use this product you would hold the 2 pieces together and apply a small amount of adhesive at the joint, it will wick or suck into the joint and set within a couple of seconds.
The medium (M300M) is 300 cps, which is great for porous materials or anywhere you may need minor gap filling qualities. To use this product you apply it to one of the surfaces you want to glue and put the 2 pieces together and hold for about 15 seconds. This product takes 15 to 30 seconds to bond so you do have a little time for positioning.
The thick (M1100G) is 1100 cps, which is used for maximum gap filling or anytime you need working time for re-positioning or to assure a good alignment between your parts. The working time of this product is 45 to 60 seconds.