Exhibit 99.1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1)(iii) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a Statement on Schedule 13D (including additional amendments thereto) with respect to the shares of Common Stock, $0.10 par value, of IKONICS Corporation, a Minnesota corporation. This Joint Filing Agreement shall be filed as an Exhibit to such Statement.

Dated: April 6, 2021

CUSTODIAN VENTURES LLC
By:	/s/ David Elliot Lazar
	Name:	David Elliot Lazar
	Title:	Chief Executive Officer

/s/ David Elliot Lazar

David Elliot Lazar