Wow. No!  100% No

Does your shield drop if you use a guard payoff item?

do not worry, it will not drop. 

Ok thanks.  I was wanting to know mostly to check the shields of some of the clan members before I send them resources to make sure their shield will be up for awhile.  I do not want to send resources and then have them vulnerable to be plundered.

Because they might not be online at the time.  If they are not regular users of shields and asked for resources and I am just seeing the request it would be nice to know how long their shield is on for before I send them the resources.  If it is not for a long time then I would wait until they were on line before I sent the resources.  :)