It's a sad commentary on society today, Ed.
If I am frisked in the street, and the cops come up with 1 pair of chopsticks, 1 ball point pen, a phillips screwdriver, a set of car keys and a Spyderco Military, then I am carrying a weapon. Minus the Spydie, my pockets are just full of tools. Never mind that I can kill a half dozen people just as easily with the other stuff, that knife is a weapon.
Now, if I am asked before hand if I am carrying any weapons, what do I say? "Yes, officer, This knife, these keys, this screwdriver, these chopsticks and this extra shoelace"? Nope. I tell them the chopsticks are a weapon and they'll laugh in my face.
On the other hand, If I tell the LEOs "No" and they search and find the Spydie, I was lying to them. Blah, blah, blah, knife is a tool blah blah.... I told them I didn't have any weapons when I did, that's the way they'll see it.
Paint splotches, glue, chunks of tape...I don't think so. Clean or dirty, that knife in your pocket is a weapon. Sad but true, sir.