I agree with PNG. Try the plastic cover that comes with a 39oz coffee can and put aluminium foil on it. Use it over and over. After the plugs are coated, hit them with a hair dryer. It evens out the ETex and drives out air bubbles. The hair dryer will also drive the mix into the belly grommit and lip, sealing them in. The Etex is easily applied with an acid brush.
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