Putting up 1x4 trim on the outside of the house what nail size can I use?? Think I want to use a nail gun to make it quick. I have an 18 gauge nailer that fits up to 2" nails, I googled if it would work and some say yes, other say no?? I dont want to spend a fortune on a nail gun as this is probably the only time I would use it, so I think I will probably just get something cheap from Harbor Freight.