Paint Buildup/Speckle?

Silver91748

Heyo, I'm trying to remake this old metal sign I found on Etsy. It seems like there are some speckles or buildups of paint on it. I think...is there a name for this? Also can someone point me in the right direction as to how I would create this effect in Substance Painter?

Here's the ref photo:

Paint speckles/buildup I'm trying to make:

BagelHero

id call this more bubbling and flaking/peeling paint the bubbles would be a fairly easy normal/height detail, but the flaking paint is maybe a little bit more complex. Should be easy enough to find more info on with the right terms though.

3D4Eva

I found this cool tutorial https://substance3d.adobe.com/tutorials/courses/substance-painter-peeled-paint-effect

Silver91748

Thanks guys!!!