The EDCO QC2B-HC-0030 double Dyma-Dot is the 30-grit, hard-concrete (red bond) diamond tooling that concrete contractors and floor-prep crews load into Magna-Trap grinders to strip coatings and level slabs. Sold as a box of three, one full disc loading, it removes general-purpose epoxy, mastic, thinset, and water-proofing membranes with precision, leaving a clean, smooth surface with minimal scratch marks.
Use cases
Typical jobs include grinding down trowel ridges and high spots to flatten a slab without gouging, removing old epoxy or paint before recoating a garage or warehouse floor, stripping mastic and thinset after tile or carpet demolition, and prepping concrete to a CSP 1-2 profile for thin-mil coatings and adhesives in commercial and residential work.
Choosing the right bond
EDCO color-codes Magna-Trap tooling by slab hardness, and the bond must be matched opposite to the concrete: red (this part) carries the softest bond for hard concrete with low abrasive aggregate, grey is for medium concrete, and yellow is for soft, highly abrasive concrete. Running the wrong bond glazes the diamonds or wears them prematurely, so check your slab before ordering.
Specifications
- Grit: 30 (aggressive removal and leveling)
- Bond: hard concrete, red color code (softest bond)
- Quantity: box of 3 dots - one standard disc loading
- Surface profile produced: CSP 1-2 depending on slab
- Fits Magna-Trap floor grinders, turbo grinders, and retrofitted classic grinders
- Quick-change design for tooling swaps in minutes
Working tips
Run the grinder in slow, overlapping passes and let the diamonds do the work - leaning on the machine heats the dots and shortens their life. If removal slows on hard, burnished concrete, the diamonds may have glazed: a few passes over a sacrificial abrasive surface (or a scrap of medium concrete) re-exposes fresh diamond. Vacuum-assisted grinding keeps dust down and also keeps fines from cushioning the cut. Replace dots as a complete set of three; mixing worn and new dots rocks the disc and leaves an uneven scratch pattern that telegraphs through thin coatings.
If you are unsure whether your slab is hard, medium, or soft, a simple scratch test with a masonry nail is the contractor shortcut: a faint line means hard concrete (this red bond), a clear groove means medium (grey), and crumbling edges mean soft, abrasive concrete (yellow). Stocking the bond that matches your local slabs saves both tooling cost and grinding time.
Frequently asked questions
How do I know I need the hard-concrete (red) bond?
EDCO color-codes Dyma-Dots by concrete hardness. Red is the softest bond, made for hard concrete with low amounts of abrasive aggregate. If your slab is average, use the grey medium-concrete version; for soft, highly abrasive slabs use yellow.
What will 30-grit double Dyma-Dots remove?
They remove general-purpose epoxy, mastics, thinsets, and water-proofing coatings, and they can grind down concrete to level a surface without gouging it.
What machines do these fit?
They fit EDCO Magna-Trap floor grinders, Magna-Trap turbo grinders, and classic-style EDCO grinders that have been retrofitted with the Magna-Trap multi-tooling disc. The quick-change design lets you swap tooling on the job in minutes.
What surface profile will I get?
Double Dyma-Dots produce a concrete surface profile (CSP) of 1 to 2 depending on slab hardness and aggregate, which is the profile most thin-mil coatings and floor adhesives call for.
How many do I need?
This is a box of three dots, which is one full set for a standard Magna-Trap disc loading. Running a complete matched set keeps the grind flat and even.
Discount Cleaning Products is an authorized dealer with US-based customer service. Our team works with janitorial contractors, facility managers, and property-maintenance professionals every day and can help you confirm fit and compatibility before you order.
