Stop priming over bare filler, it will bite you every single time

I have watched three guys in my own shop spray primer straight onto bare body filler in the last month, and all three ended up with sand scratch swelling you could see under the sealer. The filler pulls moisture from the air and the solvent in the primer soaks right in, and by the time it sits overnight you have a mess that shows up after paint. Do you guys let filler sit a full day before you touch it with anything, or am I just being old and slow about it?

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