I have some(alot) of holes on my frame I would like to close up ,and some on some body panels also, would this be good to use ? I am trying to cut down time during the grinding process.

I have read about it but forgot the name of the the wire ,but I know its only used for body panels and as filler.I will not be strong enough to joint high stress areas.Have any of you used it ,whats the name of it? Thanks