I havent worked with West System Epoxy in a while and too lazy to look up all the fillers, so let me just say this about that. West System uses different fillers for different purposes and most of these are fiberglass related. Some fillers are for strength, some are for ease of sanding, some are just for thickening as well as other purposes. For crack filling purposes, and I did this a lot, you normally wouldn't need any filler. The epoxy is usually way strong enough, unless for additional structural strength. For color, use the oak dust. It will darken the epoxy which is what you want. You can usually find more than enough really fine dust under the table saw. For actual colors, you can use an alcohol based dye or earth powders. When ever you are mixing anything with epoxy, ALWAYS, mix the Part A and Part B first. This will prevent the foreign matter from interfering with the cross linking of the epoxy molecules.
At home, we used to buy jello already made up in small plastic cups. I saved the used cups and re-purposed them into epoxy mixing cups. Also used pop sticks for the mixing. Buy them in large packages in Walmart. Sometimes the reaction of the epoxy creates enough heat to melt the cups. By that time, the epoxy was no longer any good anyway, just be ware of the heat. Whether the cups melt or not, save them for the next day. then take a hammer to it and you will be amazed what it takes to break the left-over epoxy. depending on which Part B you buy, depends on the curing time. You can look up on the West System Epoxy website and get the curing time verses temperature of the different Parts B. Trust me on this, you can set your watch by it.
Normally the regular Part B without saw dust or coloring will be somewhat milky in color. they do make a crystal clear Part B that is used a lot when people make cedar canoes. It looks like glass and the fiberglass under it becomes invisable.
Epoxy can be your best friend.
One more thing............West System also sells small hand pumps for the small cans of epoxy. Normally their epoxy is in 5 to 1 ratio and the special stuff is i think 3 to 1 ratio. With their small pumps that crew onto the screw cap part of the cans, you only pump each can ONCE. Therefore no special measuring. The pumps last forever and they are made for the specific cans. That is, a Part A pump will not fit on a Part B can and vice verse so no errors can occur.
Tony B Retired woodworker, among other things.
"Strive for excellence and settle for completion" Tony B
Last edited by Tony B; 11-15-2019 at 08:14 AM.