What masking tape is everyone using for Type AR coatings? Long story short: We used to use the St. Gobain M797 which was also known as Humiseal's HT-500. Due to numerous manufacturer issues, we stopped using it. One of our customers spec'd in the blue 3m painter's tape and we have been using it successfully for a while. We have some new assemblies where the 3m adhesion is terrible and am now back onto looking for a new tape, similar to what we all went through some 8 years ago. Craig Sullivan Manufacturing Engineer IT Administrator Phone: (607) 266-0480 x115 Fax: (607) 266-0482 Email: <mailto:[log in to unmask]> [log in to unmask] Web: <http://www.mplinc.com/> www.mplinc.com MPL, Inc. 41 Dutch Mill Road | Ithaca | NY | 14850 An ISO 9001:2008 Certified and ITAR Registered Company IPC member since 2004 _____ Confidentiality Notice: This e-mail contains privileged and confidential information which is the property of MPL Incorporated, intended only for the use of the intended recipient(s). Unauthorized use or disclosure of this information is prohibited. If you are not an intended recipient, please immediately notify MPL Incorporated and destroy any copies of this email. Receipt of this e-mail shall not be deemed a waiver by MPL Incorporated of any privilege or the confidential nature of the information. Export Control: This message is intended only for the addressee and may contain information that is company confidential or privileged. Any technical data in this message may be exported only in accordance with the U.S. International Traffic in Arms Regulations (22 CFR Parts 120-130) or the Export Administration Regulations (15 CFR Parts 730-774). Unauthorized use is strictly prohibited and may be unlawful. If you are not the intended recipient, or the person responsible for delivering to the intended recipient, you should not read, copy, disclose or otherwise use this message. If you have received this email in error, please delete it, and advise the sender immediately.