Can I use this in metal bezels and frames?

Yes!   If you're going for a domed look, I suggest adding a bit of resin in the bezel, then adding your element, pressing down to squish any bubbles out from under it. Then add a bit more resin and allow to set for 5-10 minutes so that any remaining bubbles can be dealt with before adding the final bit of resin to dome it up. If you're not sure if there are any bubbles, let the first layer set up before adding any additional resin, to ensure your results.