Description
Renders World stocks the DED77671 as the polyurethane floating disc in the Dedra DED7767 system — the 400 mm foam pad that closes onto internal lime cement and gypsum plaster after initial set, evening out trowel marks across continuous walls and ceilings where hand-floating is the time bottleneck.
Where DED77671 Performs Best — Internal Plaster Finishing
The Dedra DED77671 is a 400 mm polyurethane foam disc that floats internal lime cement and gypsum plaster to a closed, even finish once the surface has reached its initial set. It is stocked in the Renders World power floats and sponges range as the finishing pad in the seven-pad DED7767 system. The pad earns its place at the point where hand-floating slows a job down: the wide working face covers continuous wall and ceiling area per pass that a hand float cannot match, so the finishing stage stops being the bottleneck on a large room.
The choice of flexible foam over a rigid or abrasive disc is what makes the finish work. Foam closes onto the surface under moderate pressure and follows minor undulation, levelling the trowel marks and small variation a stiffer pad would either skim past or chatter against. That compliance is the difference between a uniform floated wall and a surface that shows every pass under raking light.
Why Trade Specifiers Choose DED77671
- Flexible PU foam closes onto the surface: the disc follows minor undulation for an even float finish, where a rigid pad skips across low spots and leaves them proud.
- 400 mm working diameter: covers internal wall and ceiling area efficiently in overlapping circular passes, cutting the finishing time on continuous runs.
- Plaster-chemistry stable: the open-cell foam handles the moisture content of curing lime cement and gypsum through the working window without breaking down.
- Four-strap Velcro mounting: the disc swaps onto the DED77670 carrier in under thirty seconds, so the move from sanding to floating stays quick on site.
Technical Specifications — DED77671 Pad Data Sheet
| Property | Value |
|---|---|
| Disc diameter | 400 mm |
| Material | Flexible polyurethane foam (open cell) |
| Mounting | Velcro, four-strap fitting |
| Host machine | Dedra DED7767 power float |
| Mounting pad required | DED77670 (Velcro carrier disc) |
| Primary use | Floating internal lime cement and gypsum plaster |
| Workflow stage | Finishing (post-stripping, post-sanding) |
The pad is a system component rather than a standalone tool. It works only with the DED7767 host machine and the DED77670 mounting pad, which together provide the rotational drive and the Velcro carrier the foam disc attaches to.
How to Apply DED77671 — Mounting, Pressure, Timing
Fit the foam disc to the DED77670 mounting pad with all four straps fully engaged before powering up, because partial engagement lets the disc lift under load, which marks the surface and risks the pad detaching mid-pass. Power the machine up clear of the wall and bring the running disc onto the surface — starting under load draws heavy current through the brushes and shortens their life. Then work in overlapping circular passes at light, sustained pressure; the foam has to flex onto the surface to float it, and pressing too hard compresses the disc and cancels the floating action.
Timing to the plaster's set is the harder variable. Float too early and the foam picks up wet material that bonds into the open cells; too late and the surface is too hard to respond at all. The practical window shifts with mix, ambient temperature, and substrate suction, so a small test area confirms readiness before a full wall. For the timing logic across different plaster types, the Renders World guide to power floats for render finishing walks through the worked sequence.
How DED77671 Compares to the Polystyrene Finishing Pad
The one genuine decision between two finishing pads on this machine is foam versus polystyrene, and it is settled by the surface rather than by preference — the two are sequential alternatives across different finish types, not substitutes for the same job. Renderers who specify by substrate consistently reach for the pad matched to the surface below.
| Variant | Key Spec | When to Choose |
|---|---|---|
| DED77671 PU foam pad | Flexible open-cell foam, 400 mm | Internal lime cement and gypsum plaster |
| DED77674 polystyrene pad | Rigid polystyrene, external friction profile | External thin-coat silicone and acrylic render |
Where the render finish follows on external walls, the polystyrene pad sets grain on silicone render textures; internally, the foam disc closes plaster to a smooth baseline the finish coat will not telegraph through.
Pro Tips From UK Installers Using DED77671
Two habits separate a clean foam-floated wall from a chattered one, and the first is pressure. Renderers coming off hand-floating tend to push harder than the foam needs, compressing the disc and losing the flexibility that does the work — light, sustained pressure with the machine driving the rotation delivers a far more uniform finish than forcing the head into the wall. I always let the disc cut at its own rate and keep the passes overlapping in slow circles.
The second is cleaning. Rinse the pad with water immediately after use, because dried plaster bonded into the open-cell foam is far harder to remove than wet residue, and bonded material stiffens the pad and drops the float quality on the next job. A two-minute rinse at the end of each shift extends the pad's working life considerably. Renders World ships the full DED7767 pad family from UK stock with technical guidance on stage sequencing, so the finishing kit can be specified correctly rather than bought blind.
Is DED77671 Right for Your Project?
- Internal lime cement and gypsum plaster finishing: ideal — the PU foam is purpose-built for this stage and outperforms hand-floating across continuous area.
- External thin-coat silicone or acrylic render: the polystyrene pad suits external textures better, as the comparison above sets out.
- Surface preparation or coarse sanding: earlier-stage pads in the same Dedra workflow handle stripping and grit refinement first.
- Hand-only sites without the DED7767: the pad is a system component and needs the host machine and mounting disc to function.
FAQ — DED77671 Use, Compatibility, Maintenance
Which machine does the DED77671 fit?
The Dedra DED7767 power float, attached through the DED77670 mounting pad. The mounting pad is the Velcro carrier between the machine head and this foam disc, so the pad cannot be fitted directly to the head without it. Both items are stocked alongside the pad by Renders World.
How does the foam pad differ from the polystyrene pad?
The foam disc is built for floating internal lime cement and gypsum — flexible material that closes onto the surface for an even finish. The polystyrene disc has a firmer friction profile suited to external thin-coat silicone and acrylic render. They are sequential choices across different finish types, matched to the surface rather than interchangeable for one job.
When in the plaster set should the pad be used?
After the initial set but before full cure, when the surface is firm enough to take pressure yet still workable enough for the floating action to level trowel marks. The window varies with mix, ambient temperature, and substrate suction, so test a small area before a full wall. Working too early loads the foam with wet plaster; too late and the surface no longer responds.
How should the pad be cleaned after use?
With water, immediately after work finishes. Dried plaster bonded into the foam is far harder to remove than wet residue, and bonded material reduces flexibility on the next job. A two-minute rinse at the end of each shift keeps the float quality consistent across multiple jobs and extends working life.
How long does the pad last before replacement?
Service life depends on pressure habit, cleaning discipline, and how abrasive the worked substrates are. A foam disc kept clean between uses delivers many wall surfaces of floating before performance drops. Replace it once the foam loses flexibility or develops visible tears, since both reduce the float quality the pad was bought for.