The provided reference suggests adding more water to the sand art to help the sand flow and potentially dislodge or incorporate air bubbles.
While the reference doesn't explicitly detail a method for removing bubbles with water, it implies that adding water can aid in the movement of the sand, which might help to address bubbles that are preventing the sand from flowing properly. The speaker adds water when the sand's flow is stopped. This may mean there is not enough water in the sand to allow the sand to flow properly. It could also be possible that the bubbles are a result of too little water in the mixture to start with.
Keep in mind that the success of this method might depend on the specific type of sand art and the nature of the bubbles.
