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There are many ways to weather models, here’s a Dapol (Airfix) water tower/tank kit (a bargain that can be found for around 6 or 7 ££££) after a blast of a few primers.
I usually start with the black and mist over the other shades. The yellow filler primer is fairly new to me, you can use it for lightly misting over Model trees along with the red for an early autumn look too.
Here’s the result after 2 or 3 minutes. Further work can be performed with washes and dry brushing if desired.
These paints are very toxic, so always work outside if you can and consider a breathing mask. Posh people will have a spray booth.
I have to acknowledge the late Allan Downes for this aerosol paint tip.