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I spot face with the belly hole for the gromet ( I use two different sizes of gromets depending on the plug),then drill my belly hole with another (smaller foshner bit) I dunk all my plugs in primer, then spray the final coat of primer after painting I do as many others do, swab the entire hole (spot face too) with 5 minute epoxy.. and push the gromet in to place..when I E-tex I carefully brush e-tex onto the edges of the gromet... after curing, any e-tex that is inside the gromet is removed with a carbide countersink... it works great..... I've never had an adhesion problem doing things this way...
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