Custom Concrete Tools (2025) — How to Build “The Plastic Rounded Float” Like a Pro

The Plastic Rounded Float is a must-have for any concrete finisher looking to add finesse to their slab. Unlike traditional mag floats, this tool glides over semi-set or wet concrete to create smooth, fan-like textures and consistent surface cream without digging in or leaving marks.

Every pro knows the frustration of trying to get that perfect swirl or “spinning” texture with standard floats. The Plastic Rounded Float solves that problem by combining lightweight plastic with a curved bottom, giving you precise control on decorative and functional finishes alike.

Want to make your concrete projects even easier? Check out the Concrete Buddy app — a free, all-in-one concrete calculator and estimator for pros and DIYers alike.

Why the Plastic Rounded Float Matters

This custom tool is designed for creating rough fan textures and managing surface cream where a mag float would leave smoother or uneven spots. The rounded plastic base distributes pressure evenly, making it ideal for:

  • Pulling consistent swirl or fan patterns on decorative slabs
  • Working on tight spots where mag floats don’t work
  • Finishing areas around drains, edges, and machine lines

Its durability and lightweight design let you work faster without fatigue, and because plastic won’t react with the concrete like steel, your surface stays cleaner and smoother.

Materials You’ll Need

  • Plastic Base: Use a piece of ¼" HDPE plastic or a thick green water pipe commonly used underground. Both options are tough enough to shape, but HDPE is more common if you can’t salvage pipe from a job site.
  • Handle: Marshalltown replacement handles work great — choose a length that’s comfortable for your swing.
  • Brass Screws: Use ¼-20 brass machine screws. Brass wears at a similar rate to the plastic, so your float won’t leave marks from screw wear like steel screws would.

Tools Required

  • Grinder or cutting tool (for trimming plastic if needed)
  • Drill or Drill Press
  • Tap and Die Set (for threading brass screws)
  • Heat source (optional) to shape the rounded bottom of the plastic if needed
  • Screwdriver (for tightening screws)

How to Build the Plastic Rounded Float

  1. Shape the Base: Cut your plastic to a rounded rectangle shape usually 12"x 3". If using HDPE, you can heat it gently to bend and achieve the curved bottom for smooth gliding.
  2. Bevel the Edges: Lightly bevel all edges with a grinder or file so the float won’t dig into the concrete during use.
  3. Position the Handle: Mark a spot for the handle 2" from the front leaving 1" at the back for balance.
  4. Drill and Tap Holes: Drill holes in the plastic base and use your tap and die set to cut threads for the ¼-20 brass screws.
  5. Attach the Handle: Secure the handle with brass screws. Make sure the screw heads are flush or slightly recessed to avoid scraping the concrete.
  6. Check the Curve: Ensure the bottom is smoothly rounded for proper surface contact. Re-heat or sand lightly if necessary to perfect the glide.

Pro Tips for Using the Plastic Rounded Float

  • Work on concrete that is firm and still wet.
  • Let the weight and curve of the float do the work — don’t press too hard.
  • Keep it clean during pours — dried concrete can scratch the surface.
  • Store it away from direct sunlight for long-term plastic integrity.

Why Every Pro Should Make One

Unlike off-the-shelf floats, the Plastic Rounded Float gives you complete control over texture and finish. It’s lightweight, durable, and inexpensive — you can build one for under $20 using materials from the job site or a hardware store. Brass screws ensure long-term use without leaving marks, making this tool a long-lasting part of your finishing kit.

Looking for more custom concrete tools? Check out our main guide: Best Hand Tools for Concrete Finishers (2025).

Want to take your concrete projects to the next level? Download the Concrete Buddy app for free — your all-in-one concrete calculator and resource for pros and DIYers.

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