Hey there! That's a great question about improving public spaces. The most effective way to mount a public ashtray onto an existing outdoor trash bin is using a specially designed mounting kit. First, check if your trash bin has a flat surface - most modern ones do. You'll want to clean the surface thoroughly with alcohol wipes to ensure proper adhesion.
For permanent installation, I'd recommend using a stainless steel mounting bracket kit. These typically come with rust-proof screws and waterproof adhesive strips. Position the ashtray at a comfortable height, usually about 3-4 feet from the ground, making it accessible but not too low. If drilling isn't an option, heavy-duty outdoor-rated epoxy adhesive works surprisingly well - just make sure to let it cure for at least 24 hours.
Consider the ashtray's orientation too - angle it slightly downward to prevent rainwater accumulation. Regular maintenance is key; empty it frequently and check the mounting points every few months. This approach keeps public areas cleaner and reduces fire hazards. What type of trash bin are you working with? That might help me give more specific advice!