Description
Dedra builds the DED77671 as a flexible polyurethane disc held on four Velcro straps, and its own manual lists a foam plate inside the DED7767 kit box. That makes this pad a replacement grade rather than a first purchase — worth knowing before it goes in the basket.
Floating Plaster with the DED77671 Foam Disc
The render sponge pad for power float finishing is the DED77671, a flexible polyurethane disc that Dedra publishes at 400 mm on four Velcro straps for floating and smoothing lime-cement and gypsum plaster. Renders World stocks it in the power float machines, pads and sponges collection.
The DED7767 manual is more specific than the catalogue about where foam discs belong, and the detail matters for anyone buying on the assumption that this is an indoor-only tool. Foam discs of varying hardness, it states, float and level lime-cement and gypsum plasters, internal and external alike, and it gives the foam disc the finishing pass across wall surfaces.
- Internal plaster: lime-cement and gypsum floated to an even surface, named in both the manual and the catalogue entry.
- External plaster: the same two plaster types, since the manual puts foam discs on internal and external work without distinction.
- Finishing stage: the manual's role for the foam disc is the finishing pass, after the coarser discs have done the levelling.
What Dedra Publishes About the DED77671
| Property | Value | Where it comes from |
|---|---|---|
| Material | Flexible polyurethane foam | DED77671 catalogue entry |
| Hardness grade | Medium-hard (średnio twarda) | Polish catalogue listing title |
| Diameter, descriptive line | 400 mm | DED77671 catalogue entry, technical data |
| Diameter, attribute field | 390 mm | DED77671 catalogue entry, attribute table |
| Mounting | Velcro, four straps | DED77671 catalogue entry |
| Stated use | Floating and smoothing lime-cement and gypsum plaster | DED77671 catalogue entry |
| Recommended for | Dedra DED7767 plaster float | Catalogue entry and manual accessory list |
| Producer code | 5902628776716 | Catalogue entry and store record, in agreement |
Two diameters sit on one page, which is the practical point to take from that table. Dedra's descriptive text and technical data give 400 mm, while the attribute field beneath gives 390 mm — the same figure the DED7767 manual gives for the machine's own mounting disc. Order on the code DED77671 rather than on a diameter, and any supplier quoting either number is quoting the same part.
The hardness grade is the specification most listings drop. Dedra's Polish entry names this disc medium-hard, the manual confirms foam discs come in different hardness grades, and the English entry mentions neither — so a buyer comparing two "foam discs for DED7767" is not necessarily comparing the same thing.
Fitting the Foam Disc and Running It on Plaster
Fitting it to the machine
Every preparation step happens with the machine unplugged, as the manual requires. The foam disc is a working end: it presses onto the Velcro face of the mounting disc, which is itself screwed to the spindle.
- Disconnect the machine from the supply before touching the head.
- Fit the mounting disc to the spindle, matching the bore to the shaft, and tighten its screw.
- Press the foam disc onto the Velcro face, with all four straps engaged.
- Start the machine horizontally and clear of the surface, and let it reach full speed before floating.
Running it on the wall
Dedra's method is brief and specific: adopt a stable stance, match the pressure to the work in hand, guide the machine in semicircular movements, and keep checking the surface until the smoothness you want appears. The manual adds one variable most operators discover the hard way — the plaster may be dampened as required while it is being worked, which is the documented answer to a surface that has gone off faster than the pass.
Where the floated surface is heading for a decorative finish, the guide to power float techniques and tool selection covers stage sequencing, and external elevations continue into silicone render finishes once the base is closed and sound.
Which DED7767 Disc Does Which Job
| Disc | Manual's stated purpose | Supply |
|---|---|---|
| Foam disc (DED77671, this one) | Finishing pass across wall surfaces; floating lime-cement and gypsum plaster | In the kit list, and sold separately as a replacement |
| Plastic disc with mesh | Larger irregularities, or plaster that has dried too hard for a foam pass | In the kit list |
| Two separately purchased discs — a stripping disc and a polystyrene disc | Not stated here, see below | Not in the kit; bought separately |
That last row is deliberate. The manual and the live product titles assign the two purchasable codes to opposite functions, consistently, so one of the two sources is wrong about what is in the box. Renders World is holding both descriptions until Dedra confirms them, which means those two discs are ordered by code and checked on arrival — and the foam disc above is unaffected, since its code and its function agree across every source read.
Keeping the DED77671 Working Between Jobs
Dedra ties disc condition straight to output, which turns maintenance into a diagnostic rather than a chore. Low sanding and floating efficiency appears in the manual's fault table with a single cause and a single remedy: a worn disc, replaced.
- Check before every start: the manual instructs verifying the disc is not spent, and working only with sound working ends.
- Clear the residue after each session: the manual requires cleaning work residue from the machine and its ends once the job finishes.
- Treat slow work as the signal: reduced efficiency means a new disc, not more pressure.
- Watch the machine too: the motor air intakes need clearing, best done with compressed air.
Ordering the DED77671 and What the Kit Already Includes
Renders World lists this render sponge pad for power float work at £14.50 per disc as displayed in August 2026, available, and carrying the Dedra producer code 5902628776716 as its barcode. No VAT treatment is displayed against the price on the product endpoint, so none is stated here.
Before adding one to a first machine order, check the box. The manual's kit list for the DED7767 includes the mounting disc, a plastic disc with mesh and a foam plate, so a machine bought new should already carry a foam disc — this SKU earns its place as the replacement when that one loses its flex. Buyers assembling a full preparation and finishing kit will find the Dedra DED7767 plaster float page carries the machine specification, and the basecoat stage that precedes any floated finish runs through the EPS adhesives basecoats range.
FAQ — Fitment, Plaster Types, Care and Spares
What does the DED77671 need to run?
The Dedra DED7767 plaster float, which Dedra names as the machine this disc is recommended for, plus the mounting disc that screws to the spindle and carries the Velcro face. The foam disc attaches to that carrier by its four straps rather than to the machine head directly.
Is it an internal-only pad?
No. The manual states that foam discs float and level lime-cement and gypsum plasters both internally and externally, and the catalogue entry names those two plaster types without restricting them to indoor work. Match the disc to the plaster, not to which side of the wall you are standing on.
How should the disc be looked after?
Clear work residue off it at the end of each session, as the manual instructs for the machine and its working ends, and check its condition before every start. Replace it when floating slows, since Dedra gives a worn disc as the cause of low efficiency and a new disc as the fix.
Do I need one if I have just bought the machine?
Probably not immediately. The manual's kit list puts a foam plate in the box with the DED7767, so a new machine arrives able to float — order this disc as the spare that keeps a job moving when the original wears, and confirm the contents of your own delivery against that list.
Technical Documentation
- Dedra DED7767 instruction manual (PDF) — disc types and their purposes, assembly, operating method, maintenance, fault table, accessory list and kit contents.
- Dedra DED77671 catalogue entry, English — material, diameter, mounting and stated use.
- Dedra DED77671 catalogue entry, Polish — the only source read that states the medium-hard grade.