When I was finished (for now), I tapped the lid back on with my rubber mallet. I thought it was on tight.
Since I wasn't going to use it again right away, I took the can out to my laundry room and gave it a good shake. Bad idea! The lid flew off and I had stain everywhere! On me, on the floor, on my Swiffer mop and on my trash can!
Note to self: If you are going to shake a can of stain be sure you have a BIG can of paint thinner and a nail brush handy!
BTW. If anyone knows how to get stain off plexiglass please let me know.
UPDATE: From How Stuff Works
Follow these steps to remove oil-base paint stains from Acrylic Plastic, Plexiglas, Polyurethane, Vinyl Clothing:
Wipe excess immediately with a cloth dipped in warm sudsy water. Oops. Too late.
Rinse thoroughly with warm water and wipe dry. Do not use a thinner on these materials, as it will eat through them. Unable to rinse said object.
If necessary, dip a cloth into a dry-cleaning solvent and quickly but gently dab at the remaining stain. Do not have any dry-cleaning solvent. Think alcohol might work? Q-tip and "warm sudsy water" nine hours later????
Rinse well and wipe dry
I'm going to work now. I've done enough damage around here this morning...