A mask according to the invention includes a masking having a first side, a second side, and a perimeter opening. The second side is either tacky or has an adhesive applied and includes a backing, and the first side may include a cover. In use, the backing is removed to apply the mask to a hatch on a surface, with the perimeter of the hatch exposed through the perimeter opening. If used, the cover is then removed and liquid sealant is applied to the perimeter through the perimeter opening. Excess sealant collects on the masking rather than on the hatch or surface surrounding the perimeter. Once the sealant dries, the masking is removed.