Some of us like to try every new ostomy appliance that comes along -- by taking product samples distributed at UOA Chapter meetings, by scanning the ads in Ostomy Quarterly and phoning the manufacturers' toll-free numbers, etc. In this way, we keep up with advances in ostomy products. But if you do this, remember that chemicals used in different types of appliances aren't always compatible. Therefore, use lots of adhesive remover when switching types of appliances.
Normally, when changing appliances, it doesn't matter if you leave a little residue from the old one. However, when changing to a different type of appliance, residue may significantly affect adhesion or wearing time of the new type you are testing. For this reason, it is also best to try two samples of any new appliance type. Your second sample may be a better test than the first one.