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Epoxy Mixing Board

I don't like flexible plastic or cardboard for mixing. I went to my local paint store and bought a dozen lids for one gallon paint cans. If you are too lazy to clean them when you are finished, you can use 1 lid 2 times. If you clean them, you can use them many times. If I mix large quantities, I use a plastic cup big enough so it won't overflow in my vacuum chamber.
 
How much epoxy are you all mixing at a time? 99% I do very small batches, and it's sticky, so use old business cards. Get way too many at every job, so still using ones from 15 years ago. 1000 on the epoxy shelf.

Slightly larger quantities I tend to use medication mixing cups. The larger ones are like... I wanna say 20 ml. That's usually a lot of epoxy. They are slick, smooth walled, easy to mix in, and runnier things don't get away from me which they can on boards.

I went to art school, had to deal with lots of this back then including trying to do large amounts of epoxy for silly sculpture projects (I did not like sculpture classes) using paint mixing methods. That was: acrylic or lexan scraps. Cut to squares of whatever size you want (about a foot) and they are rigid, scrape pretty clean pretty easily. First mixes can even be done with the protective film on, then you peel it off and have a clean one to start with. This was cheap in art school where we had lots of material being used, so scraps abounded. If you like flat things, anything flat and reasonably rigid would be okay.

They also make things for this. Rigid backers, stack of impermeable sheets. Mix, tear off and throw away. Sadly, most are in the ultra-ghey "artists palette" shape like this:
Remember again, I went to art school and saw ZERO people using the swoopy thumb-through-palette method. Everyone uses rectangles. Here's one:
Note that it has features you won't care about like acid-free and neutral gray for color matching. Look around and I bet you can find cheaper.
 
For small jobs, I tape wax paper (one piece of tape at each corner) to my workbench and mix on it. Everything is very handy then. I use tongue depressors for mixing. If a square corner is needed, a 1" chisel does that job well.
 
Any plastic container with the little recycle triangle on the bottom and the letter HDPE, LDPE or PP will work excellent. I use squares of smooth HDPE for mixing, but I work in the plastics industry and have access to these things.
 
I save the plastic cup tops that come with certain medicines like cough syrup. They're graduated in .oz's so you know you're getting the mix ratio correct if you're not weighing the resin/hardener. You can throw them out when you're done without worrying about the cost. They sell them in sleeves fairly cheap, it's not like you have to buy a $12 bottle of Vicks or Robitussin to obtain them.

In my experience, simple household rubbing alcohol makes short work of cleaning up epoxy.
 
Man am I way behind on this. I have never thought of all the cool stuff I could be buying and robbing to mix on and throw away. I am still using the worthless UPS and Fed Ex boxes that accumulate everyday, and a $1.57/500 count bag of sticks from the Hobby Lobby.
 

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