Seal a print?

[3DPiper]

I have a DLP SLA printer and have designed a specific mouthpiece for a musical instrument like a recorder or whistle.

However, all of the resin manufactures I have emailed say their resin (even when cured) is not food safe and should never be put in the mouth.

Is there something I could dip the mouthpiece in (or at least the part that will be in the mouth) to completely seal it and make is safe to put in the mouth?

I see that there are polyurethanes to seal wood, would that work? Or maybe a quick dip into silicone..?