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, Late 2012/2013/2014/15) A1419

Product ID: 517132903

📅Fits iMac 27" A1419 (2012-2015)

📏Precision-cut adhesive strips

🛠️Pro-grade opening wheel tool kit

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Rp965888

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Sold byAmazon IndonesiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🖥️ Unlock your iMac’s potential with precision and ease!

DURABLE RELIABLE - High-quality adhesive tape engineered to maintain a secure, long-lasting bond under daily use.
ALL IN ONE REPAIR KIT - Includes premium opening wheel tool kit for effortless iMac screen removal and installation.
PROFESSIONAL PACKAGING - Solid, protective box keeps adhesive strips pristine until you're ready to upgrade or repair.
TAILORED FOR YOUR I MAC - Specifically designed for 27-inch iMac A1419 models from 2012 to 2015, guaranteeing perfect compatibility.
FLAWLESS FIT EVERY TIME - Precision-cut LCD adhesive strips ensure seamless reassembly without folding or damage.

LeFix Replacement LCD Panel Adhesive Tape Strip Sticker kit includes precision-cut adhesive strips and a professional-grade opening wheel tool, designed specifically for 27-inch iMac A1419 models from 2012 to 2015. Packaged securely to prevent damage, this kit ensures a flawless, durable screen replacement or upgrade experience.

Specifications

Brand	LeFix
Manufacturer	LeFix
Model	946-4547
Package Dimensions	41.91 x 5.21 x 1.4 cm; 59 g
Item model number	946-4547
Standing screen display size	17 Inches
Batteries Included	No
Batteries Required	No
Does it contain liquid?	No
Manufacturer	LeFix
Country of Origin	USA
Item Weight	59 g

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