Is it possible to apply putty in the bathroom? If so, what product to use?

The kitchen is an area exposed to higher moisture.  Despite that putty can be applied there.  In areas such as the kitchen and the bathroom it is necessary to apply lime putty, which due to lime alkaline properties, feature resistance to biological corrosion and deposits of microorganisms - bacteria and mould.  Lime putties ensure also vapour permeability, i.e. possibility to get rid of  excess of moisture.   ACRYL-PUTZ RV13 RENOVA lime putty is a recommended product to be applied in the aforementioned areas.

When can we apply gypsum putty after plaster application?

It can be applied on fresh lime and cement plasters after 3-4 weeks and 2-3 weeks in the case of gypsum ones.  The plaster prior to putty application ought to be almost perfectly dry.  It’s worth bearing in mind that conditions prevailing at a particular construction site affect the drying period of the plasters. 

What primers to use prior to gypsum plasters?

In order to prepare the substrate prior to plaster application, it’s necessary to strengthen them by applying Deep Penetrating Polymer Primer ACRYL-PUTZ® or Universal Polymer Primer ACRYL-PUTZ.  The selection of an agent depends on the substrate absorption degree.   Additionally, if it’s necessary to provide better adhesion of the substrate we need to apply Contact Polymer Primer ACRYL PUTZ, which strengthens the substrate and forms a rough layer. 

How to prepare powder putty correctly?

The intended amount of the powder compound must be put in a container with water - ratio approx. 1kg of the product per 0.4l of water.  The content of the container must be mixed carefully by slow-speed agitator till obtaining a uniform, easy-to-apply and clump-free compound.   After approximately 5 minutes mix the compound again.  Every time, prior to commencing work with powder putty, it is necessary to familiarize with the label provided on the container or Technical Data Sheet.

Is it necessary to mix ready-to-use putty?

All the information concerning mixing can be found on the label or Technical Data Sheet.  Some ready-to-use putties do not require mixing, other ones must be mixed prior to use by taking advantage of a slow-speed agitator so as to prevent air from getting into it.

How to calculate the quantity of necessary putty?

The putty efficiency depends on the thickness of applied layer and is the following: 1kg/1m2 per 1mm coating.   The efficiency data regarding a particular product can be found on the container or Technical Data Sheet.

When should we apply the second coating?

In the case of “wet to wet” application, the subsequent coating can be applied as soon as the previous one of 2-3mm thickness has dried in 75%.  If we want to apply the subsequent coating on the dry one then the drying time is approx. 4 hours.  However, it is necessary to keep in mind that the period is subject to conditions prevailing in a particular area. 

How to apply putty onto walls?

Putties are applied onto walls manually or mechanically.  In the case of manual application putty must be applied onto a wall by stainless steel finishing trowel by pressing it so the compound adheres precisely to its surface. 

What tools are necessary to apply putty?
  • a min. 5-liter bucket for compound
  • a small stainless steel trowel
  • a stainless steel putty knife  
  • a large stainless steel trowel 
  • a driller or slow-speed agitator
  • an agitator for putty compounds  
At what temperatures can we carry out putty application?

Application temperatures are provided in the Technical Data Sheet for each product.  However, in most cases the temperatures cannot be less than +5 and more than +30 degrees Celsius. 

How long does one coating dry?

The drying period is subject to its thickness, putty properties and conditions prevailing in the application area.  On average the period for one coating is approx. 1 hour. 

How can we recognize if the coating is dry?

The dry coating should not be wet.  We can test it by touching its surface with our palm.  Also, the dry coating features a uniform texture, without wet spots.  In addition, the dry coating features a relevant toughness. 

What to use to sand the walls after putty application?

Use sandpaper or abrasive mesh. 

What grit size should abrasive material have?

Sandpaper or abrasive mesh should have the following grit size: 100-150 

When should we use priming agents?

Priming agents should be used on:

  • new mineral and gypsum plasters
  • new gypsum putties
  • uncoated cardboard gypsum panels
  • walls covered with poor quality paints
  • walls after removing old painting coatings
  • stains or damp patches after their removal
  • when adjustments were performed at the wall, including filling in holes.
Is it necessary to prime cardboard gypsum panels prior to putty application?

Yes it is, as gypsum and cardboard are highly absorptive materials.  Cardboard gypsum panels can absorb water from the putty which may result in incorrect curing and consequently contribute to crumbling and cracking.