(4) Prepared more quickly in cool temperatures than thickened fuels. _b. Preparation._ (1) Open 5-1/4-pound can or cans of thickener. (2) Add 2 mess kit spoonfuls of water to each can of thickener. Stir until the water disappears in the thickener. It is not necessary to mix the water uniformly with all of the thickener. (3) Proceed at once as directed in paragraph 35. Avoid accidental addition of any water to the thickener or fuel other than that stated in (2) above. (4) Peptized fuels set a little more quickly than the usual thickened fuels, but their general appearance after setting is the same. After standing, however, peptized fuels spontaneously become thinner and may be poured without use of pressure. The time it takes for thinning to occur depends on the temperature of the fuel. At 75° Fahrenheit or higher, thinning occurs in approximately 1 to 2 hours. At temperatures below 60° Fahrenheit, thinning occurs several days after preparation of the peptized fuel. (5) If water has accidentally gotten into fuel before addition of the thickener, peptizing action takes place, but the results are unpredictable because the quantity of water added is not controlled. =36. PREPARATION OF LIQUID FUELS.= _a. Choice of ingredients._ Thin fuels are * * * reaching the target. For this reason, liquid fuels should contain the lowest proportion of gasoline and the highest proportion of heavier fuels that permit easy ignition. In hot climates, * * * of great importance. =The gasoline used can be any U. S. grade of motor fuel or aviation gasoline.= Suitable blends are as follows: * * * * * (3) (Added). By volume, 20 to 25 percent gasoline and 75 to 80 percent light fuel oil. * * * * * =40.1 USE OF PACKBOARDS= (Added). Detachable pressure tank and valve assemblies (par. 66.1) make possible the use of packboards for transporting pressure tanks, 5-gallon cans of fuel, wrenches, and additional ignition cylinders close to the front line of combat to troops using flame throwers. As packboards are not manufactured specifically for servicing flame throwers, standard quartermaster-issue packboards are used. Packboard transportation is practicable only with pourable fuel. (Pourable fuels include some thickened fuels and all liquid fuels.) _a._ The following is a suggested procedure for packboard transportation: (1) Lash all necessary filling and charging supplies for one flame thrower to packboard, using lashing rope and straps. (2) Tie one pressure tank and valve assembly to top of one flat 5-gallon fuel can so that flexible shaft and handle hang down parallel to one side of the fuel can. (3) Carry wrench with large enough opening to unscrew filling plugs from tops of fuel tanks and to tighten plugs after filling. (4) Carry extra ignition cylinders. _b._ Return empty pressure tank and valve assembly along with empty fuel can and wrench on packboard to flame thrower servicing point.