Would you recommend covering exposed dentin with Vitrebond prior to etching?

Any time you have exposed dentin in a Clark Class II, would you recommend covering it with Vitrebond prior to etching?

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DR CLARK'S RESPONSE

Actually I have gone back to bonding resin and flowable composite because glass ionomer doesn't fully set for 24 hours. When I re-prep the saucer or simply cut Vitreond that has inadvertantly flowed onto the enamel, I see it delaminating (at 16X under the microscope).