If the bag might need to be returned, I would warn against doing anything yourself.
You do not want to give any opportunity for your defect to be rejected on the grounds that you have done something to the zip.
If you can telephone H and speak with someone who can advise you, you could ask if t would be alright to try the wax candle idea - it does seem an excellent suggestion.
You do not want to give any opportunity for your defect to be rejected on the grounds that you have done something to the zip.
If you can telephone H and speak with someone who can advise you, you could ask if t would be alright to try the wax candle idea - it does seem an excellent suggestion.