Bonding helps
plasterers achieve
a smooth finish by providing a key as it simply sticks well to the surfaces it is applied to. In addition to using bonding plaster as a base coat for surfaces which will be plastered with a skim layer or polished afterwards, it can also be used on surfaces like concrete too.
Do I need to PVA before bonding coat?
If, however, the bonding cost is pretty smooth and hasn’t got a good ‘key’ for a finishing coat to adhere to then
there’s no harm in putting PVA on
. You won’t need to re-moisten it before the finishing coat as long as it’s tacky, if it’s not then put another coat of 50/50 PVA/water on. Hope this helps!
What is Thistle bonding coat used for?
Thistle BondingCoat is an ideal
base coat plaster for smooth or low suction backgrounds such as tiling, concrete, plasterboard or surfaces treated with Thistle Bond
-It. The fine mix allows for improved workability, making it easier to spread, rule and darby.
How long does Thistle bonding last?
ThistleBond-it, stored correctly, has a shelf life of
6 months
. Tubs are stamped with the date of manufacture. The base must be capable of providing support, be clean, dust-free, dry and frost-free.
What is gypsum bonding used for?
Gyproc Bonding Coat is a lightweight
undercoat plaster for use over smooth or medium suction backgrounds
. It can be used over in-situ concrete when pre-treated with ThistleBond-it.
How thick can you put bonding on?
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 finish plaster, such as Thistle MultiFinish.
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
.
Is PVA a Waterproofer?
Timber can be sealed with PVA to
give it a waterproof quality
, although if the surface of the timber is to be subject to any wear or traffic, then PVA, as it is an emulsion, will eventually fail. … At least 3 coats of undiluted PVA are required and each coat must dry thoroughly before the next is applied.
How long does PVA take to dry before bonding?
PVA Sealant on Concrete
It requires
around 30 minutes to one hour
to allow the glue set on the concrete. Further, the curing time is approx. 24 hours. You must wait and leave the concrete till the glue dries up.
Do you need to PVA a painted wall before plastering?
Do not use PVA
.
However, it is more preferable to use a primer or top coat and water down the first layer by 10%. This allows the initial coat to properly soak into the plaster aiding adhesion of the final coat.
How much does a bag of bonding cover?
bags the coverage is
4-6 square metres per 25kg
.
Can you use out of date Thistle bonding?
If it is
mixed up and shaped before the final setting
, then it should be fine. If it starts to go stiff whilst on the trowel, and you still spread it out, you are actually working with half-set plaster, so it’ll only ultimately fully set to half (ish) its normal strength.
Can you paint over bonding?
If you have some multifinish at hand, I’d put a skim coat of that on top of the bonding first, but if you don’t then go right ahead and
paint the bond coat directly
. It’ll soak up your paint, so you should probably put on a couple of layers of diluted paint first mainly to seal it.
What’s the difference between Browning and bonding?
Bonding is a undercoat plaster for low suction background like concrete. Hardwall has high impact resistance and is quicker drying. Browning is a undercoat plaster for moderate backgrounds with adequate mechanical key. A lot of plasterers now seem to use Hardwall.
What’s the difference between bonding and undercoat plaster?
Bonding Plaster: Bonding is an undercoat plaster. This means it is the first coat, or undercoat to be applied to a new (or to be patched) wall. … Browning Plaster: Browning plaster is also an undercoat plaster for use on more absorbent surfaces.
Can I use bonding plaster to fill holes?
Bonding coat can fill large holes/chunks. It’s all in the mix – your looking for a
whipped cream consistency
. I find it makes it very easy to apply. Slap it on and leave it rough, don’t try to finish it when it’s just been applied.
