EDCO's 30-grit Double Dyma-Dot is the general purpose workhorse for coating removal and surface prep on medium-hardness concrete. Concrete contractors and rental users run these dots to strip epoxy, mastic, thinset, and waterproofing membranes while leaving a clean, level surface with minimal scratching and no gouging - the floor comes off the grinder ready for its next coating. Sold in a pack of 3 to load a full Magna-Trap disc.
Use Cases
The grey medium-bond Dyma-Dot covers the most common prep and removal jobs:
- Stripping general purpose epoxy and paint from warehouse and garage floors
- Removing tile mastic and thinset after demolition, ahead of new flooring
- Taking off water-proofing coatings and membranes before resurfacing
- Leveling high spots and rain marks on medium-cured slabs
- Producing a CSP 1-2 surface profile for coating adhesion
Matching diamond bond to slab hardness is the single most important decision in floor grinding. Run a hard-bond dot on hard concrete and the diamonds glaze over and stop cutting; run a soft bond on soft concrete and the segment wears away in hours. The grey medium bond here is EDCO's general purpose choice - the right starting point when you have not tested the slab, and the correct match for typical interior slabs poured at standard PSI. The Double Dyma-Dot pattern puts two diamond dots per segment, which balances aggressive removal against surface finish: coatings come off fast, but the floor is left level and uniform rather than dished or swirled, ready for the next grit step or directly for many coatings.
Specifications
30-grit Double Dyma-Dot segments, medium-bond (grey) for medium concrete. Pack of 3. Concrete Surface Profile produced: CSP 1-2. Compatible with EDCO Magna-Trap single-disc and dual-disc floor grinders and 7-inch, 9-inch, and 10-inch turbo grinder models.
If you are unsure of your slab hardness, there is a simple field test: drag a fresh dot across the bare concrete for a few feet. If it skips and polishes without producing dust, the slab is harder than the bond - step down to the soft-bond yellow. If the segment wears visibly fast and throws heavy dust, the slab is soft - the grey will still work but a harder bond lasts longer. On typical interior slabs the grey medium bond is the right answer, which is why it is the highest-volume Dyma-Dot in the line and the one rental counters hand out by default.
Run the grinder with dust extraction connected whenever possible - keeping the cut clear of spoil lets the diamonds stay in contact with fresh surface and extends segment life noticeably compared with dry grinding into a dust bed.
Frequently Asked Questions
What is the difference between grey, yellow, and red Dyma-Dots?
The color is the bond: yellow is for soft concrete, grey (this one) for medium concrete, and red for hard concrete. Matching bond to slab hardness is what keeps the diamonds cutting instead of glazing over.
What machines do these fit?
They fit EDCO Magna-Trap single and dual-disc floor grinders and the 7, 9, and 10-inch turbo grinder models, using the Magna-Trap magnetic quick-change mount.
Will 30 grit gouge the floor?
No. The Double Dyma-Dot geometry is designed to remove coatings and level concrete without gouging, leaving minimal scratch that a following grit step or coating covers easily.
How many dots do I need?
This is a pack of 3, which loads one standard Magna-Trap disc. Dual-disc grinders take a pack per disc.
Discount Cleaning Products is an authorized dealer with US-based customer service. Our team has supplied facility managers, janitorial companies, and cleaning contractors for decades, and we are happy to help you confirm fit or compatibility before you order.
