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When a substantial area is covered, Thistle Hardwall is worked and ruled as in hand plastering. It is easier to attain the required thickness of plaster in one application by machine, but the total thickness should not normally exceed 25mm (subject to background suitability).
How thick can you put bonding on?
How thick should a bonding coat be? Floating coats should be applied at a thickness of 8mm, up to a total plaster thickness of 25mm, and wire- scratched between each coat. The final floating coat should be ruled to an even surface and lightly scratched to form a key for Thistle Multi-Finish.
What’s the difference between Hardwall and bonding?
bonding is a undercoat plaster for low suction background like concrete. hardwall has high impact resistance and is quicker drying.
How long does Thistle Hardwall take to dry?
Allow Bond Coat to dry for 45-90 minutes depending on the thickness and environment that it’s drying in. When its no longer wet to the touch you are ready for the finish coat of plaster.
How thick can you use bonding plaster?
Both bonding and browning plasters are considered undercoat plasters. Undercoat plasters are typically applied at 8mm thickness for ceilings and 11mm thickness for walls. Following application of undercoat layers then a finish coat is added which should be 2mm thick normally.
Do you scratch bonding coat?
That all sounds good – I would apply PVA to the whole wall. If you skim after a period of time and the bonding coat has dried then damp down with water or PVA so as to try to match suction to the rest of the wall as near as possible. If the bonding coat is very smooth then scratch slightly.
How thin can bonding coat be?
Don’t worry it’ll be fine, providing it’s been correctly applied. 8mm is not a minimum thickness. I, along with many others, frequently use it a lot thinner than that as an initial build over very course Artex patterns prior to skimming with Multi.
Can you skim over Hardwall?
You can plaster directly over hardwall the day after. As Wine~o said, pva either day before or prior to skimming. Try not to over saturate the hardwall as it will blister. Blue Grit will give a much longer workable time.
Do you need to PVA before bonding?
2 Answers from MyBuilder Plasterers If the bonding cost has been gone over with a scarifier before it dried (like a hand held rake) to put little troughs in it for the finishing coat to adhere to then PVA is not required.
How long does Hardwall take to go off?
Bonding about 2-3 hours, but some do leave it to following day before skimming depends on size of area. The 3-4 days is a guide, the colour of the plaster will tell you when it’s dry enough to paint.
Can you second coat plaster the next day?
Can you second coat plaster the next day? Yes you can plaster over it again. Give the original dried out plaster a coat of PVA to seal it,, let it dry,, say overnight, then tomorrow or whenever, PVA it again, then plaster onto it right away while it’s wet/tacky.
Is SBR better than PVA?
One key difference is that, whereas PVA remains water soluble after drying, once dry SBR is not. Consequently, the SBR bonding agent is more suitable for situations where damp might be a factor, such as external finishes, shower areas and swimming pools, as well as in sand or cement screeds and renders.
Should I PVA before Hardwall?
You should put PVA on, but you cannot tile onto hardwall. It will need to be gone over with multifinish and then allowed to dry. A tiling sealer (not PVA) should then be applied prior to fixing tiles.
Can you put bonding on bonding?
Dental composite , or dental bonding can be added to a previous one, with ease, however there is particular protocols necessary, and the experience of the bonding dentist.
How long before plastering should I PVA?
Nojob Smallenuf New Member. Not a plastering expert but I think the routine is to apply 1 coat of PVA and allow to dry fully i.e. 24 hrs., and then apply second coat of PVA maybe 1 hour or so prior to application of plaster. The second coat should be tacky rather than dry.
Can I paint over Hardwall?
Thistle plasters can be decorated with most paint finishes and wallcoverings. A permeable paint can be used in the interim. Take care with Thistle Hardwall which dries from the surface, appearing surface dry before it is fully dry in depth.
How long do you leave bonding coat before skimming?
Bonding about 2-3 hours, but some do leave it to following day before skimming depends on size of area. The 3-4 days is a guide, the colour of the plaster will tell you when it’s dry enough to paint.
How much does a bag of Hardwall coverage?
Thistle HardWall
| Order Code | Nominal bag weight (kg) | Approx coverage (m²) |
|---|---|---|
| 06110/3 | 25 | 3.0 |
Why is Hardwall plaster cracking?
If the background has a lot of suction/or is very dry, the plaster will crack as the moisture is absorbed too quickly into the substrate,, it needs prep first, to control the suction. Too much heat will do the same by drying the plaster to quickly causing it to shrink and crack.
Can you tile straight onto bonding plaster?
You don’t tile onto bonding – finish plaster or one coat plaster, yes, but not bonding or browning.
Can you skim over damp bonding?
Brummie Taffy New Member. Can skim over bonding after a couple of hours or so which should be enough time for it to set. Can leave til next day if big area for instance and then wet down or use pva on it. If skimming over straight after set then skim straight onto.
How soon can you plaster over bonding?
Bonding about 2-3 hours, but some do leave it to following day before skimming depends on size of area. The 3-4 days is a guide, the colour of the plaster will tell you when it’s dry enough to paint. Need to leave decent time between paint coats, for each to throughly dry before applying the next one.
