Would this work for a 2019 21.5 4K iMac?

No. The tape strips work for a 27" monitor -- the length and placement of the notches won't suit a 21.5"

How difficult is it to remove this adhesive if the machine needs to be re-opened once sealed back up with these strips?

It is not hard to remove at all. One week after i used those strips, the screen fell off of my computer while i was sleeping. I bought a new screen but the logic board got damaged so now i have an 2020 i9 iMac that does not work. I would recommend the the 3M strips instead.

Is there any diagram how to use it? The strips look confusing and fragile. There must be a diagram provided either in this product page or in the box.

If you're talking about where the strips need to be installed I had wondered the same thing until I searched also on Ebay then it showed a diagram. #11 goes in the top left, #12 top right, #13 Right side and so forth all going clock wise in # order.

Anyone know if this will work on Late 2013 14,1 iMacs? 21.5”

14.1?it's fit for Late 2013 iMac 21.5" machine.

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LeFix Replacement LCD Panel Adhesive Tape Strip Sticker + Opening Wheel Tool Kit for iMac 27 inch A1419 Year 2012 2013 2014 2015

Product ID: 91375540

📏Precision-cut adhesive strips

🖥️Perfect fit for iMac 27" A1419 (2012-2015)

🛠️Pro-grade opening wheel tool kit

SAR 57

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Description

🖥️ Seal your iMac’s future with precision and pro tools!

ALL IN ONE REPAIR KIT - Includes a professional opening wheel tool kit designed specifically for iMac repairs and upgrades.
TAILORED COMPATIBILITY - Engineered for iMac 27" A1419 models from 2012 to 2015, including Retina 5K editions.
EFFORTLESS INSTALLATION - Heat-activated adhesive maximizes bonding strength when applied on clean, dust-free surfaces.
DURABILITY MEETS PRECISION - High-quality adhesive strips resist wear and maintain a secure seal after every repair.
FLAWLESS RE SEAL EVERY TIME - Premium straight adhesive strips ensure a perfect, dust-free bond for your iMac display.

LeFix Replacement LCD Panel Adhesive Tape Strip Sticker kit offers precision-cut, premium adhesive strips plus a professional opening wheel tool kit, designed exclusively for iMac 27" A1419 models (2012-2015). This all-in-one solution guarantees a flawless re-seal after display removal, ensuring durability and perfect fit for your device repairs or upgrades.

Specifications

ASIN	B07GX8DFNB
Best Sellers Rank	#11 in Computer & Mobile Device Repair Kits
Customer Reviews	4.6 4.6 out of 5 stars (2,422)
Date First Available	January 24, 2018
Item Weight	1.76 ounces
Item model number	946-4547
Manufacturer	LeFix
Package Dimensions	16.45 x 2.05 x 0.47 inches

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