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Cyclone Disc driver

Typhoon Disc Driver

Hurricane Disc driver

Ceiling Grinder Bracket

SDS - Scrapper Adaptor Kit 

Floor Grinder Bracket

Poly Cub Floor Grinder

Super Polivac Burnishers 

Edge Grinder Bracket

Crack Chaser Bracket

Floor Cutting Bracket

Drywall Sander Bracket

Cup Wheel Spacer Nut

250mm Jumbo Cup Wheels

180mm Rombo Cup Wheel

180mm Jumbo Cup Wheel

The Rombo Abrasive Shoe

Grand Master Alligator PCD

The Funnel Web Cup Wheel

Grandmaster Tiger PCD

Floor Grinder Adaptor Kits

125mm Dust shrouds

180mm Dust Shrouds 

180 & 230mm Cutting Shrouds 

Concrete renovator

Paint Pole Tool Holder

Grandmaster Scraper

GrandMaster Vacuum

Tile Grout Removal Bracket












Frequently Asked Questions

This page contains answers to common trade discussions had by me with other building workers, along with some tips and tricks of the trade that you might find useful, and are presented here as questions.

Dear Grandmaster

Concrete Grinding and Surface Preparation

1) What is the best diamond cup wheel for the grinding of walls and ceilings?

The Rombo is the best cub wheel for all tasks and has a non segment loading pattern that is better for removing glues and compounds .

[Handy Hint] It is also worth owning a Grandmaster edge grinding tool for all your edge grinding tasks.

2) What is the best cup wheel pattern for the removal of glues and water proof compound?

The GrandMaster Tiger Cup design,  provides long lasting aggressive compound removal and smooth grinding action and is the world's most durable PCD Tool Design.

[Handy Hint] Remove most of the weights off the GrandMaster floor grinder and operate at high speed

3) What is the best method of removing staples and nails from concrete ceilings?

I recommend the use of the GrandMaster ceiling grinder with an attached Grandmaster 115mm Blade

[Handy Hint] treat the cut nails and staples with an epoxy resin.

4) What can I do to reduce eye injury when grinding concrete ceilings? 

Painful eye injuries  are a very common problem when grinding ceilings as sand, girt and hot pieces of wire travel at great speed and very abrasive to the eyes.  To reduce the likely hood of eye injury use a GrandMaster ceiling grinder, safety glasses and  a brimmed cap or hat. 

[Handy Hint] To reduce fogging of glasses and assist good vision , use clean, unscratched safety glasses  and bridge the rim of your safety glasses slightly on your nose.

5)  What is the most suitable small vacuum for concrete grinding and drywall sanding when using the Norton Grandmaster product range?

I recommend the use of  the Grandmaster industrial vacuum cleaner as it represents the most advanced vacuum cleaner technology in the world.   

[Handy Hint]  Use a Grandmaster dust separator for heavy dust extraction tasks.

Concrete Ceiling Preparation and Setting.

6) What Brand of Drywall Plastering Boxes are most suitable when used in conjunction  with the Grand Master dust extraction box handle for the setting of concrete ceilings?

All known brands can be fitted, however the I prefer a "fat boy" box design as it reduces the frequency of reloading and allows for greater productivity.

[Handy Hint] To reduce cleaning time spray all tools with vegetable oil and quite literally pack the kitchen sink complete with high pressure hose and good quality trigger gun as this will dramatically reduce cleaning time.

7)  When setting concrete ceilings with a flatbox do I need to install a rubber blade?

No, the stainless steel blades are fine and providing the ceilings are well grinded with a Grand Master ceiling grinder, you will have long blade life.  Additionally these blades are relatively cheap and fit the flatbox

[Handy Hint] Ceiling setting is best preformed by a two man operation as the porous nature of concrete dries the very plaster quickly, therefore you will need somebody preferably skilled in the art of drywall plastering to feather the edges behind each joint set, this is done with a 10 inch plastering blade and Grandmaster pole mounting apparatus.

8)  When setting concrete ceilings with a flatbox what size flatbox is used?

Begin the first coat with a 8 inch box, once dried then the second coat 10 inch and 3rd coat with a 10 or 12 inch box.

Handy Hint] Bridge the undulations of the uneven concrete ceiling with the first 2 filler coats and, scrape the protruding materials off between coats with a secondary pole attachment  i.e. [grandmaster pole mounting apparatus attached to a scraper]. 

9) What compounds can be set with a drywall plastering box?

I successfully use a plasterers flat box to set concrete ceilings and walls with  the following compounds, cornice cement, smooth patch, paint texture, faring mortar and high build mortar .

[Handy Hint] Premix cement additives in water and add to the patch compound for lump free mixture.

[Handy Hint] When applying the 'filler coat's add  pre soaked [overnight] vermiculite to the plaster mix and remove coarse mesh from plaster pump.  

10) What are the advantages of setting a concrete ceiling with a drywall flatbox?

With a two man team, it is possible to joint set [for a heavy stipple finish] and complete up to 400 square metres a day this is many times faster than even the best hand setter .  

[Handy Hint] White setting can also be preformed by using a 3 coat, cross hatch patching method.  .

11) What is the best method of preparing large concrete balcony ceilings for a very fine texture or painted finish?

Due to the fact that I have seen many painting contractors lose $1000's of dollars on high rise jobs trying to perform this difficult  task I have compiled the following detailed instructions.  For a very fine texture or painted ceiling finish it is vitally important that the  surface of a concrete ceiling is as made flat as a sheet of drywall [otherwise surface imperfections will show up in changing light conditions].  Due to the fact this task using conventional methods is very labour intensive and very hard to achieve, it is recommended that you use a render material that contains sand [soft patch compounds are generally unsuitable] and involves the following steps : 

Step 1, grind the entire concrete ceiling to a very high standard with a GrandMaster ceiling grinder:  

Step 2, paint or spray the surface of the ceiling with a bonding agent:  

Step 3, set the formwork joints  with Dulux Acra patch 500 and a flatbox : 

Step 4flatbox set the ceiling with a fine paint render and smooth with a wide render blade attached to grandmaster pole mounting apparatus: 

Step 5, use a plastic float to achieve a smooth, flat  finish.  

man team can complete approx 200 square metres a day 200m x $30 = $6000. 

Drywall Plastering, fixing and sanding

12  What is the best method of maintaining plaster flat boxes ?

The Plasterers flat box is a very widely used and productive accessory, found in most drywall plasterers tool kits.  Due to the fact that their is little to no printed information to be found in regards to the correct adjustment and maintenance of a flat box, I have compiled the following list so that you can rejuvenate your ageing equipment to set long straight lines and have perfectly feathered edges.

Flatbox maintenance tips

  1. Always store your boxes without the setting gauges on [Over time the brass blade holder has a tendency to lose its slightly concave shape].

  2. Before use, always spray boxes with lubricant such as CRC, RP7 or vegetable oil this makes boxes easier and faster to wash and ensures plaster does not accumulate in those hard to reach areas.

  3. Settings on your boxes is between 2 - 3 the other settings are more suitable for a skim.

  4. New blades require to be bent a little, so they don't fall out of the brass blade holder.

  5. When inserting a new blade make sure end screws on the brass blade holder are all the way out, so as when you apply the box onto the drywall surface the blade sits above the stainless steel holders which are held by the brass blade holder.

  6. As new blade wears out, keep adjusting end screws to achieve a perfect feathered joint finish.

Trouble Shooting Tips:

  1. Regularly clean compounds from under blade.

  2. Adjust screws every few jobs.

  3. Replace blades regularly.

  4. Make sure brass holder in its 2-3 settings moves freely.

  5. Spray boxes with lubricant frequently.

  6. Sometimes the brass blade holder will need to be removed and reshaped into its original shape.

  7. If your flat box loses a lot of compound from the back flap, it is generally because of wear and tear of the 2 bushes that hold the back flap onto the axel.  To solve this problem, simply remove screws on back flap and replace bushes on axel [No more leaks].

  8. Check wheels every few years.

  9. Compounds should not be to sloppy and should not pour out of the openings.

[Handy hint] The GrandMaster paint pole adaptor can also be attached to sanding poles and be used for plaster feathering tasks.

Drywall Sanding Tips.

16)  When drywall sanding, with festool sander what sander speed is recommended? 

To avoid the risk of over sanding the soft plaster compounds, I recommend a speed control setting of between  2.5 to 3.5 . 

[Handy Hint]  To avoid gouging, start off by placing sander directly onto plasterboard beside the joint, then move on to plaster joint. 

[Handy Hint] To ensure you get the maximum life out of your sander, regularly use dry high pressure air to blow sander and wheel bearings out (preferably while the machine is running)

17) My interface pads keep flying off my sander, how do I keep them on?

Super glue. A few drops on the base pad . 

[Handy hint] To remove glue build up on sander base pad and improve adhesion of new interface pad.  Wipe base pad lightly with paint thinners {to prevent damage to base pad} and scrub vigorously with wire brush.

18) Because the head of an eccentric sander is smaller than a porta cable or giraffe drywall sander, does this mean that it has less  working performance? 

No, because a smaller eccentric hand sander is much lighter to use and can be worked more comfortably for much longer.  Additionally it is able to sand work in confined areas, this means that there is a lot less hand detailing to do. 

[Handy Hint] To extend the life of the interface pad and abrasive sheets, take care and avoid running your sander head into nails and timber doorway fixtures etc.

Rendering and Patching

19) What is the best method of repairing deep holes in concrete walls and ceilings?

Prepare hole with bonding agent:  apply a firm but tacky high build mortar  to a sized sheet of plastic and push the mortar into the hole with your hands, then trowel into level shape.  This plastic sheet acts like a solid sheet of formwork and prevents the mortar from falling out.  Allow the material to harden for approx 3 hours then remove plastic sheet and trim protruding material :  upon mortar curing complete repair with faring coat mortar and smooth patch finish.

[Handy hint] This technique is also recommended for drywall repairs.

20) What is the best method of rebuilding drip lines in balcony soffits?

Cut ceiling with the GrandMaster ceiling chaser and jack hammer out core.  Paint  the concrete with bonding agent then re-mold each section of the drip line using fillet molding timber and faring cement mortar.  Once dry remove fillet molding timber and patch with smooth patching compound.

[Handy hint] To repair curved sections use plastic fillets, drill holes in each end and staple with concrete nails to obtain the correct curve, additionally make sure all fillets are sprayed with vegetable oil for easy cleaning and reuse.

21) What is the best method of applying render?

I recommend the use of  PFT Ritmo rendering machine,  For further information click on to www.pft.de/

[Handy hint] I consider this model is most suitable on construction sites as it is the most portable.

22) What proportion of a rendering task is preformed by a PFT Ritmo rendering machine.

Approx 40% the other 60% of your time is used in finishing.

[Handy hint] To ensure trouble free operation ensure that you carry a spare rotor stator in case of breakdowns, 

23) How do I clean the rotor stator of a PFT Ritmo rendering machine, if I have a breakdown during pumping.

This information is not contained in their operation instructions and will need to be soured from agent upon purchase.

[Handy hint] Empty hopper of dry bag render, fill hopper with water, remove remote operation plug and use forward and reverse settings on the rotor stator switch to clean rotor.

24) How many metres can a standard hand renderer complete in a 8 hour day?

On average only about 20 to 25 metres a day.

[Handy hint] To improve productivity a incorporate a render toweling machine into your operation.