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troubles with model polypainting

Hello everyone,

I have a problem and no clues how to solve it. I created a model and I appended three subtools I created to it (hair and two eyes). I tried to polypaint all of them and I can to it without problems on all three subtools but I can NOT paint on the model. I’ve searched on a thousand tutorials and forums a possible cause for this but I didn’t find anything.
Do you guys have an idea of what is the reason and how can I solve it?

Thank you

Marianna