I bought a Slime brand tire inflator to top up my tires, and it broke on the first use. It turns out that the internals are 100% plastic. Plastic cylinder, plastic piston, plastic gears, plastic connecting rod, even the pressure gauge mechanism is all plastic. The plastic connecting rod had snapped after the plastic piston seized up inside the plastic cylinder. Piece of junk.
WTF, Slime? I have lost all faith in the brand. I guess I shouldn't have expected too much from the company that makes TPMS-destroying sealant.