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- I typically mix and measure into one cup. The only times I don't is when I'm making a larger batch than normal (lately normal batches are around 200-250 ml) where my measuring cups aren't large enough to hold the total amount of resin and the weight will be more than either of scales I currently have in the garage can measure.
- There is some amount of residue left in the cups but since I'm generally only doing this for larger batches it's usually not enough to screw up the mix. The measurements being off by 5 ml is going to have a huge affect if you are only mixing 30 ml of resin but it's not nearly as big of an issue when mixing 300-400 ml of resin.
- Most of the disposable plastic mixing cups use a smooth plastic that resin will actually release from although not as easily as from silicone. In addition to the plastic cups I use syringes like these instead of pipettes. When I'm done casting for the day I lay the cups on their side or flip them upside down on a silicone mat and the syringes get stood up in a silicone cup with the plungers pulled out. Once the resin is cured it usually only takes me 5-10 minutes to get all of the cups and syringes cleaned up and ready to use again. Occasionally something breaks while I'm trying to get the resin out but for the most part I've been using the same cups and syringes for over a year now. If there is some amount of residue that I can't peel out that will affect accurately measuring the next time I use that cup will be when splitting off some amount of resin from a larger batch for different colors. If the residue in the cup is tacky/sticky I use paper towels or cleaning wipes (usually whichever is closer/easier to grab) to get most of the residue out and then wipe with isopropyl alcohol to get the remainder.
- We have tried a few different brands of resin and at this point stick to the ones that we have had the best results with. I will occasionally grab a small/sampler kit of a new to us brand to test. Different resins have different properties and which one is the best option varies depending on what you are making and what you can afford. Currently we have one main brand we use for most projects however we do use other brands depending on what the project needs. I do pay attention to cost but I care more about cost per ounce than the total price. Other big factors I look at when deciding what resin to get are 1) yellowing concerns, 2) clarity and bubble issues (some stuff is too big to fit in a pressure pot), 3) the properties of that specific resin, and 4) how easy it is to access the data sheets and safety info.