Can you make Apple Watch water proof again

There are too many variables here!

• The skills of the person who works on your watch
• The possible damage around the edge of the case so the display assembly does not sit fully down
• Surfaces are fully clean, heat and pressure are applied to make sure the adhesion of the parts are good

Replacing the touch sensor as well as the display and the parts where hermetically sealed so the adhesive surfaces doesn’t degrade on the shelf.

I wouldn’t go swimming but washing hands and quick showers should be fine.

Even Apple won’t guarantee a repaired watch is waterproof again.