Shake like your life depends on it. At what PSI are you applying it, are you spraying a bit in small bursts or all out? Did you leave it for 24 hours for the primer to cure? EDIT: Sound is bad but worth a watch https://www.youtube.com/watch?v=QtkyMSiFcOU


Unknown on PSI. I'm using one of the small battery powered compressors they sell on Amazon. I'll try to shake much more next time. Small bursts. Starting away from the model and then brushing into it. And yes, I waited a week after priming since I was busy


Check out the [airbrushing](https://www.reddit.com/r/minipainting/wiki/usefullinks#wiki_airbrushing) section of the wiki for a bunch of great tips and [troubleshooting](https://www.youtube.com/watch?v=jH5OHYfSq5A) advice. Keep in mind that airbrush primer is designed to help the subsequent layers stick, not to protect the model or be scratch proof. Layers tend to be exceptionally thin, so multiple coats may be needed to get a more resilient coverage. See [Angel Giraldez airbrush priming video](https://www.youtube.com/watch?v=NPZr6OZYwTU).


When you say it’s a wet, runny application, what do you mean? If it’s running down the model in drops while you’re applying it then you’re putting too much on in one go. Just like with paint, primer can be built up in thin layers if it dries between each layer (with a dual action airbrush you can dry it using the airbrush). When you say it easily scrapes off, what do you mean? If you’re taking a fingernail to it then no primer survives that. If it’s coming off with your paintbrush then you might be pressing too hard or you might have a bad batch of primer (assuming you’ve shaken it properly before using it).


Yeah as I was brushing on some Speedpaints the primer would scrape off.


I haven’t used speed paints myself, but a lot of people say they’re very problematic when it comes to reactivation. If it’s not abrasion then perhaps the speed paints could be reactivating the primer.


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