Air Bubble While Driving

If it is truly an air bubble with no water underneath then your plan to fix it is good. However getting it done before your trip might not be as imperative. Fixing it right is better in the long run than fixing it fast. The next thing to remember is that you have to get the air out before you roll it to spread the glue or else the air will push under other areas and cause more separation. The right fix is to cut open the blister, glue down the membrane, seal over the cut. With time blisters do occur. Eventually leading to needing a new roof. Nursing it is okay unless you nurse it too long because water intrusion is destructive.