A sealer is a substance or device used to protect and preserve something. It forms a protective layer or barrier to prevent any damage or leakage. Full definition
All documents required must be original documents, but certified copies with lifted seal of the original documents are acceptable. (chabilmarvillas.com)
I store them in sealed containers in the freezer for whenever I need them. (theorganicdietitian.com)
I have NEVER (knock on wood) had my jam not seal with this method and they have never gone bad. (gooddinnermom.com)