it is not a requirement. It has been common practice to paint, unpoured seals, yellow, and then red after pours, but it is not a requirement.
This is interesting. Does anyone have photos? Do you paint the whole fitting? Or just a red / yellow ring around it? Is there a 'standard'?
We've been putting on a little dinky label that says "seal poured". It's kind of an issue - it's not obvious from the outside if the seal is poured, and you wouldn't want to open one that is. I guess you can check if the plugs are finger tight.
Does anyone worry about the seals cracking when the machines are shipped? Our machines flex a little when they are lifted up. We have to take off encoders otherwise our coupling shafts will be broken. I worry about the material inside the seals getting cracked when everything flexes. But our customers certainly prefer when we pour the seals for them.