I just received my new Sharpe Platinum spray gun, gravity feed, hvlp. It uses a small plastic cup filter and gasket at the base of the cup. Should I order a few of these filters and gaskets to have on hand as I learn to spray with it? I thought I might order some now to have on hand. Are these filters and cup gaskets likely to need replacing often? I only expect to spray one or two cars and then miscellaneous items around my shop.