Description
The Dedra DED7767G24 abrasive disc is the medium-coarse grit-24 face for the DED7767 power float: a 370 mm Velcro-mounted sanding disc that strips old paint, removes adhesive residue, levels uneven masonry, and smooths EPS insulation board faces at machine speed. Renders World stocks it as the second-pass refinement disc that follows heavier stripping work.
Where the DED7767G24 Grit Disc Earns Its Place on UK Render Sites
Old paint layers, adhesive squeezed from EPS board joints, and uneven masonry all need to come off before fresh render or basecoat will hold — and a hand-sanding approach across a full elevation costs days. The DED7767G24 handles that preparation work at machine speed on the Dedra DED7767, presenting a 370 mm grit-24 face that strips and smooths across multiple substrates without a tool change. Browse the wider Renders World power floats and sponges range for the full preparation and finishing sequence.
Grit 24 sits in the medium-coarse band of the DED7767 abrasive range, and the position matters: aggressive enough to take down adhesive ridges and weathered paint on the second pass, fine enough to leave a face that takes basecoat or primer cleanly. Trade applicators who treat the disc as a refinement tool rather than a stripping tool consistently produce preparation work that downstream pads close in fewer passes.
Why This Grit 24 Disc Saves Time on Site
- Grit 24 abrasive face: medium-coarse grade that levels and refines without the deep scoring coarser discs leave behind.
- True 370 mm working diameter: covers more square metres per pass than smaller-class abrasive discs, cutting pass count on full elevations.
- Multi-substrate capable: strips paint, removes adhesive and plaster residue, levels masonry, and smooths EPS faces — one disc across the full preparation stage.
- EPS-smoothing capability: takes down minor steps between insulation board faces ready for basecoat without damaging the polystyrene structure.
- Direct fit DED7767 platform: attaches via the four-point Velcro on the standard mounting disc; no adapter or modification required.
Technical Specifications — DED7767G24 Abrasive Disc Data
| Property | Value |
|---|---|
| Disc type | Coated abrasive disc |
| Gradation | Grit 24 (medium-coarse) |
| Working diameter | 370 mm |
| Mounting system | Hook-and-loop (Velcro), four-point |
| Host machine | Dedra DED7767 power float |
| Workflow position | Abrasive refinement — after grit 16 stripping, before plastic flattening |
| Compatible substrates | Painted masonry · adhesive residue · plaster · EPS insulation board faces |
| Manufacturer reference | DED7767G24 (Dedra, Poland) |
The values above are confirmed against the Dedra manufacturer specification for the DED7767G24 disc. The 370 mm diameter is intentionally smaller than the 400 mm wear-pad family because abrasive cutting is most controlled at a slightly tighter footprint — the same machine carries the disc through the four-point Velcro pattern on the standard mounting plate.
How to Use the DED7767G24 Effectively on UK Sites
The disc works best with light, even pressure across the full 370 mm face, kept moving in overlapping passes rather than dwelling in one spot. Tilting onto an edge digs the abrasive into the substrate and produces gouges that take longer to remove than they took to create, while pressing harder rarely speeds the cut — the grit does the work when the face stays flat.
Approach a preparation pass in this sequence: clear loose flaking material by hand so the disc engages continuous substrate, engage all four Velcro corners onto the mounting pad, then sand in overlapping straight passes across the elevation. On painted masonry, two slow passes typically clear more material than one forced pass — heat builds quickly when the abrasive face loads, and a hot disc cuts slower rather than faster.
For the full preparation-through-finishing sequence on UK projects, the power floats for render finishing guide covers each stage with technique notes for paint stripping, EPS smoothing, and substrate refinement before the basecoat layer goes on. Many EWI installations sequence the grit work straight into the EPS adhesive and basecoat application on the same day.
Installation Notes — Mounting, Pressure, Replacement
Engage all four Velcro corners onto the DED776701 mounting disc before powering up the machine. A partly-engaged abrasive disc walks under load — visible immediately as inconsistent scoring across the surface, and harder to correct than to prevent. A quick brush-down of the Velcro on both faces between elevations keeps grip at full strength; embedded grit and adhesive fines are the most common cause of premature pad slip on otherwise serviceable kit.
Eye protection and a particulate-rated dust mask are non-negotiable for abrasive work, especially when stripping painted surfaces or sanding EPS board faces. Both substrates produce airborne particulate that operators should manage with appropriate PPE throughout the work — pre-1992 painted surfaces may contain regulated coatings, so check the substrate history before stripping and apply current site safety practice for the coating type identified.
Replace the disc once the abrasive face loads with material and cutting speed noticeably drops. A loaded disc generates excess heat as it skates across the substrate rather than cutting it, and on EPS that heat softens the polystyrene face into a glazed finish rather than a clean smooth one. A fresh disc costs less than the time spent forcing a worn one through work it can no longer do efficiently.
How the DED7767G24 Compares to the Grit 16 Sibling Disc
The DED7767G24 pairs with one direct sibling in the Dedra abrasive range. The table below shows the relationship between the two grit grades.
| Variant | Key Spec | When to Choose |
|---|---|---|
| DED7767G16 grit 16 disc | Coarse abrasive, 370 mm | Heavy stripping and aggressive levelling |
| DED7767G24 grit 24 disc | Medium-coarse abrasive, 370 mm | Second-pass refinement and EPS smoothing |
The two grit grades are sequential rather than alternative on most preparation jobs: the grit 16 disc cuts fast through thick paint and aggressive levelling, then the grit 24 disc refines the surface and leaves a face that takes basecoat cleanly. Skipping the grit 24 stage leaves visible grit-16 scoring that downstream wear pads cannot fully remove — which is why finishing trades using the Dedra system typically carry both grades on site.
How Pros Get the Best Result From This Grit 24 Disc
Experienced operators treat the DED7767G24 as the disc that decides whether the preparation stage delivers a clean platform for the rest of the workflow. The pattern below is what consistently produces a substrate ready for basecoat or primer.
- I switch off grit 16 earlier than instinct suggests: coarser-disc time saved at the stripping stage gets paid back at the flattening stage when scoring won't lift out.
- I keep light pressure across the full disc face: grit 24 cuts when held flat — loading one edge dulls the abrasive and gouges the substrate.
- I work overlapping passes in straight lines: stationary contact loads the abrasive face faster and builds heat that softens EPS.
- I retire loaded discs immediately: a loaded face cuts slower, generates more heat, and costs more in time than a fresh disc costs to fit.
- I treat EPS smoothing as the disc's natural workflow position: hand-sanding board joints across an elevation is slow, and a coarser grade damages the EPS face.
Is the DED7767G24 Grit Disc Right for Your Job?
The disc occupies a specific workflow position in the Dedra preparation sequence. The bullets below help confirm where it fits.
- Second-pass paint stripping or surface levelling on the DED7767: a strong fit — the grit 24 grade refines what the coarser disc leaves behind.
- EPS face smoothing on EWI installations: well suited — the grade is aggressive enough to take down board-joint steps without damaging the polystyrene structure, with the surface ready for basecoat application after.
- Heavy first-pass stripping on thick paint or aggressive levelling: use the DED7767G16 grit-16 disc for the first pass — this grit-24 follows.
- Flattening pass after abrasive work is complete: the DED77670 plastic float pad is the next stage once the grit discs have done their work.
- Operators without the DED7767 host machine: the disc fits the Dedra platform only — confirm machine model before ordering.
Order the DED7767G24 alongside the matching grit 16 disc and the rest of the Dedra preparation set for a complete platform refresh, or contact the Renders World technical desk for advice on building the full preparation-to-finishing pad sequence for a specific project programme.
FAQ — DED7767G24 Use, Compatibility, Replacement
Which machine does the DED7767G24 fit?
The Dedra DED7767 power float exclusively. The 370 mm working diameter and four-point Velcro pattern match the DED7767 mounting plate through the standard carrier — no adapter required. Smaller Dedra machines in the 375 mm class and other manufacturers' power floats use different geometry and will not match reliably.
How long does one DED7767G24 disc typically last in service?
Working life varies sharply with substrate. Stripping painted masonry consumes the abrasive faster than smoothing EPS board faces, where the disc lasts considerably longer. As a working guide, a single disc covers a full elevation of paint refinement or several elevations of EPS smoothing before the cutting speed noticeably drops.
When should grit 24 be used rather than grit 16?
The grit 16 disc is the aggressive first-pass tool — it cuts fast through thick paint layers and heavy levelling work, but leaves visible scoring. Grit 24 follows as the refinement pass, removing that scoring and leaving a cleaner platform for the plastic and polystyrene wear pads. Most full preparation jobs use both grades in sequence.
Can the disc be used to smooth EPS insulation boards on EWI installations?
Yes — grit 24 is the recommended grade for smoothing EPS board faces and taking down minor joint steps before basecoat goes on. Coarser grades risk damaging the polystyrene structure by cutting too aggressively or by softening the face with friction heat. For the wider EWI workflow context, the power floats for render finishing guide covers preparation sequencing on insulation systems.
How should the disc be handled during work to extend its life?
Keep light, even pressure across the full 370 mm face — loading one edge dulls the abrasive prematurely. Brush off accumulated residue periodically; a loaded grit face cuts slowly and generates excess heat. Storing the disc flat in a dry container between sessions protects both the abrasive coating and the hook-and-loop backing.
Is the disc suitable for outdoor work in damp UK conditions?
Light damp does not affect the disc itself, but cutting performance drops on wet surfaces and the abrasive loads faster. For best results, work to a substrate that is dry on the surface — neither grit grade is designed for fully wet substrates, and abrasive performance on damp paint or contaminated surfaces falls off sharply compared with clean dry substrate.