Thanks. I must've watched one too many videos over at wholeelise. She mostly makes liquids, not solids, but it's fascinating to watch!haha I totally get it! What I did was look in at all my cavity molds, and think about what shape I wanted to hold in my hand. I've experimented with a few different ones, and have learned a few things along the way:
1. Cubic or round shapes work best because they wear more evenly, something like this or like this or like this. I've also used soap molds shaped like dahlias and sunflowers which worked pretty well; they were just REALLY large so you will be using the same bar FOR-EVAH.
2. Rectangular shapes, or those with a thinner plane and a thicker plane (e.g., your standard bar soap shape) tend to wear unevenly and eventually break into pieces. That's not a big deal if you don't mind remelting them back together, or using them in a thin mesh bag, but I prefer to avoid the extra work myself.
To figure out size in terms of how much product, if you watch Marie's video for the recipe she made (the one I customized above), it fit into one cavity of what appeared to be a standard sized silicone muffin mold (another great option for a mold, btw).
I don't think that's a good sub, honestly. Gums are used for thickening, which is not what you are after. Glycerin or an oil that's nice for hair will be your best bet here, especially if you want to use what you have on hand, or you want to buy something that can also be used in a lot of other products.
I use silicone muffin pans for my CP dish soap and I have a couple ergonomic shaped silicone 6 cavity molds that I use for standard CP soap because my husband prefers the more commercial type design over the brick shape of traditional handcrafted soap. I can't blame him as they ARE easier to twirl in my hands and I just attach the old bar to the new one when replacing it in the shower so no waste. I'm thinking a bit smaller molds for shampoo and conditioner, though. I haven't decided if shampoo and conditioner should be different shapes or if I should add a touch of color to just the shampoo to make them easier to identify/distinguish from each other in the shower sans glasses.
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