Strait-Flex® Mid-Flex

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Mid-Flex is a muddable, paper-faced composite, flexible corner bead that finishes inside and outside 90° and off-angle corners.

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Strait-Flex Joint Tape

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What is it for?

The composite structural backing provides strength for durability and impact resistance.  The heavy-weight, diamond punched paper provides maximum adhesion for an even lay-down of the paper edge and reduced edge cracking.  Strait-Flex Mid-Flex is packaged in 100 ft. rolls that can be cut to the desired length in the field to minimize scrap loss.

  • Memory-free hinge produces straight corners and perfect angles
  • Smooth nose provides a square, low profile – drywall knives will not catch, snag or puncture center hinge
  • Composite-fiber structural backing provides strength and embeds into compound to provide a superior bond to the drywall surface
  • Diamond-punched paper edging provides maximum adhesion – no cracks, no call backs
  • Paper surface is pretreated to accept paint, finishing compound is not required over the laminated area – uses the half the compound vs. standard corner bead
  • Paper will not fuzz-up during finish sanding like paper and mesh tapes
  • Installs with all-purpose joint compound.  No special tools or fasteners are needed.  Lightweight compound may be used to finish.


Make sure the surfaces of the corner are clean and smooth. Measure corner and subtract 1/2”. (1) For accurate measuring of Strait-Flex® Mid-Flex and less waste, feed roll through slot on top of box. Hook tape measure on the hole below. (2) Fold Mid-Flex in half with the print side facing out. (3) For outside corners, fold more than the desired angle. For inside corners, fold less than desired angle. (4) Most professionals prefer to cut the ends of Mid-Flex at a 45º angle.

(5)  Apply a liberal coat of all-purpose joint compound to both sides of the corner with a 4” or 5” taping knife.  (6) Press Mid-Flex into the wet compound. Adjust, if necessary, to create a straight line. (7) Wipe down tight with taping knife using a little additional pressure on the outer edges. Let dry completely over several hours or overnight.

(8) Apply a light skim coat of compound to the outer edges of Mid-Flex with a 4” or 5” taping knife. No compound is required over the laminated area of Mid-Flex. Wipe down tight and smooth. Let dry completely over several hours or overnight.

(9) Apply the final coat of joint compound with a 6” or 8” taping knife. Feather the compound beyond previous coat. A very light coat of compound is all that’s needed. Using lightweight compound in this step makes sanding easier. Let dry completely over several hours or overnight.

(10) Sand lightly with 120 grit sandpaper. Mid-Flex will not fuzz-up like paper or mesh tapes.

 

What others have to say - Testimonials 

"I have used Strait-Flex Tuff Tape and Original for years so have always trusted the product. When I was introduced to Mid-Flex and Wide-Flex, I gave them a go and have now transitioned to them full time, moving away from the leading NZ competitor product, for any mid to wide angles" - Rangi (Pro Stopper)

"Ideal for off angles and outside 90 deg. Corners, vaulted ceilings, coffered ceilings, butterfly vaults, and Bay windows. Straightens framing irregularities. Memory-free hinge design allows for ease of installation, straighter corners, and perfect angles. Diamond-punched 94 lb. Paper edging allows for easier feathering, faster drying, and the highest bonding strength. Also guarantees an even lay-down of the paper providing maximum adhesion with no rippling or blistering. Pur-laminated nose ensures perfect corners without paper fuzz-up during finishing and sanding. Second coat of compound can be applied immediately with a very light skim-coat to finish. Cuts easily with knife or scissors. Rustproof. No cracking" - Martin (Pro Stopper)​




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