If you don't get any help here, go to The Ornamental Plaster WEB Site. Brian Ewing is the best. If you have more info on what you're doing, do provide it to him.
Tell him Jay J from renovateyourworld.com sent ya. My best to ya and hope this helps.
PS: I don't get any $$$ for referring you. He use to 'hang' on this Forum but he has his own business AND his own Forum too. He had to give this Forum up.
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