Search for inexpensive plastic mixing cups

[flyingbalut]

For the purpose of mixing paints: After hearing about the possible use of silicons in the manufacture of paper drinking cup . . . I began researching and testing disposiable plastic drinking cups. What I have so far learned: Most all have plastic cups has a marking on the bottom. A triangle with one of these letterings: "PETE" (polythylene terephthalate) "PP" (polypropylene), or "PS" (Polystyrene). 1. Testing PETE plastic cups from Sam's Club. Works great for mixing my polyurethane clear with no ill effects to the sprayed on finish. Discolors from clear to milky white when storing Acetone for long periods, OK for short term use. 2. PP or polypropylene cups are the best, but not as availiable as PETE. This is the plastic that commercial paint mixing cups are made of. Excellent for long term shortage of Acetone and thinners. 3. Never use PS (polystyrene) for solvent base paints. Good only for waterbase paints. Plain mineral spirit and paint thinner eats it up.

To correct any error I may have stated: You can do your own research. The key is the "triangle and letters" marking on the bottom of the cup. This will tell you what kind of plastic is being used. There are numerous type of plastics. Lots of information to found by goggling "plastic symbols".

I heard about the use of silicon in paper cups and the possible cause of painting fisheye. I believe I briefly read about it on this forum awhile back. I never kept up with the thread so if it's already been covered, I do apologize.

[TroySmith80]

I'm not sure if you're interested or how they might react with your products, if at all, but there is a local guy here in Bend who sources these environmentally friendly cups (many other products as well). They are said to be sustainable/renewable and I believe they may be biodegradable; although maybe not if covered in dry paint. I'm going to pick some up for my work but i use water-based products.

Contact: Owen Mitz
Phone: (541) 389 - 5400
email: Owen@LavaEdge.Net
Oregon Green Products

[crashracer]

I've been using reuseable silicone "Kids" cups for awhile now. I use them for mixing epoxy resins for carbon fiber projects. Nothing sticks to them, even when heated residue falls out then it hardens.