RPM 2020 Proxy Statement

RPM INTERNATIONAL INC. • 2628 Pearl Road • P.O. Box 777 • Medina, Ohio 44258 • 330-273-5090 Frank C. Sullivan Chairman and Chief Executive Officer August 26, 2020 T O RPM I NTERNATIONAL S TOCKHOLDERS : I would like to extend a personal invitation for you to participate in this year’s Annual Meeting of RPM Stockholders, which will be held in a virtual meeting format on Thursday, October 8, 2020 at 2:00 p.m., Eastern Daylight Time. At this year’s Annual Meeting, you will vote (i) on the election of four Directors, (ii) in a non-binding, advisory capacity, on a proposal to approve our executive compensation, and (iii) on a proposal to ratify the appointment of Deloitte & Touche LLP as our independent registered public accounting firm for the fiscal year ending May 31, 2021. We also look forward to giving you a report on the first quarter of our current fiscal year, which ends on August 31. As in the past, there will be a discussion of the Company’s business, during which time your questions and comments will be welcomed. Due to the public health impact of the Covid-19 pandemic and to support the health and well-being of our stockholders, employees and their families, this year’s Annual Meeting will be held in a virtual meeting format only, through a live webcast. You will not be able to attend the Annual Meeting physically in person in light of public health concerns. You will be able to vote and submit questions by visiting www.virtualshareholdermeeting.com/RPM2020 and participating live in the webcast. A secure control number that will allow you to participate in the meeting electronically can be found on the enclosed proxy card. All stockholders are cordially invited to participate in the Annual Meeting. Whether or not you plan to participate in the Annual Meeting virtually, the return of the enclosed Proxy as soon as possible would be greatly appreciated and will ensure that your shares will be represented at the Annual Meeting. If you do participate in the Annual Meeting virtually, you may, of course, withdraw your Proxy should you wish to vote during the Annual Meeting. On behalf of the Directors and management of RPM, I would like to thank you for your continued support and confidence. Sincerely yours, F RANK C. S ULLIVAN