Do not skimp on infiltration time. The samples are infiltrated when they sink to the bottom of the tube. Rotating the specimens can aid infiltration, although this is a bad idea with LRWhite. Mix and store as for Polybed812. Place specimens in molds.
Position specimens with wood sticks or a pair of dedicated tweezers.
Place in oven, making sure to keep the mold flat. After 10 minutes, check to make sure the specimens are positioned as desired and that there are NO air bubbles. Let polymerize over night.