Ohio Rev. Code § 3511.07
When mailing unsealed identification envelopes and unsealed return envelopes to persons, the board of elections shall insert a sheet of waxed paper or other appropriate insert between the gummed flap and the back of each of such envelopes to minimize the possibility that the flap may become firmly stuck to the back of the envelope by reason of moisture, humid atmosphere, or other conditions to which they may be subjected. If the flap on either of such envelopes should be so firmly stuck to the back of the envelope when it is received by the voter as to require forcible opening of the envelope in order to use it, the voter shall open such envelope in the manner least injurious to it, and, after markingthe voter's ballots and enclosing them in the envelope for mailing to the director,the voter shall reclose such envelope in the most practicable way, by sealing it or otherwise, and shall sign the blank form printed on the back of such envelope.
R.C. § 3511.07