Siser Glitter on 100% polyester duffle bag

[GraphxNMore 282]

I have a customer wanting monogram initials on a duffle bag. It is 100% polyester. I know Siser says "uncoated".....what exactly is uncoated? I did a test on my daughter's makeup bag that feels exactly like the customer's bag and the following happened. It seemed to adhere, and no fading or damage was apparent to the bag. Should I do this and risk damaging a hard to get bag? Or respectfully decline? It was white glitter over pink/gray chevron. You can also see through the vinyl, which I've never had happen.

[jaybyrd 3,770]

My motto when it comes to customers stuff is if in doubt pass. Could you press regular easyweed first then overlay with the glitter?