I set up a little camp in a local park and used some discarded bricks to support a cheap pot purchased at Goodwill for $1.99. The heat would be supplied by a simple empty can filled with Methylated Spirits - crude but effective. My pot wasn't big enough for all the gum, so the whole load was done in 4 batches.
A container of raw gum; The outdoor setup; Melting in the pot
Once each batch was thoroughly melted, I ended up pouring it through a cheesecloth filter with the ends tied to sticks to form a loose basket. All the video's I've seen show two people twisting the gum out with a filter, but I was alone, so I did my best to squeeze out as much as possible before the gum began to set. The purified gum with its deep amber colour was collected in an aluminum baking tray.
Pouring out the hot pitch
Lifting up the cheesecloth filter
Twisting in opposite directions to squeeze out
Tray full of purified resin
I've saved the used, resin soaked, twisted cheesecloth with the sticks to be used as great firestarters for the campfire next year. Back at home, the tray was put in the freezer for a while and then the frozen and brittle mass of gum was cracked into chunks for storage into a ziplock bag. With this haul and the previous load back at the cottage, I've got about 6.5 pounds of purified resin. Should be enough to make the quantity of pitch I'll need for sealing the canoe in the spring.
Frozen mass of gum; Broken chunks; Stored away