Green Grit Issues

Does any other plasterers have problem with plaster going hollow on green grit?

Come on mate, you can't just ask that kind of question without providing some context about the substrate(s) you've been applying the green grit to. My guess is high-suction substrates, which grit isn't necessarily ideal for.
 
I think it's high suction can effect. I'm sure I seen sbr recommended then green grit over on the YouTube demo? Used grits over polytex and gloss surfaces.
 
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