Surface Prep: Velvaglo

Surface Preparation Guide for Velvaglo

Ensure that surfaces are dry, sound, and free from dust, dirt, grease and oil before painting.

1. New Work:

Plascon Velvaglo Premium1.1 Cement plaster, concrete, fibre-cement, unglazed brick, Gypsum plaster (e.g. Rhinolite, Cretestone): Prime with PLASCON PLASTER PRIMER (UC 56) or PLASCON MULTI SURFACE PRIMER (WUP 1) in order to obtain an unbroken barrier coat to seal alkaline surfaces properly.

1.2 Wood: Seal knots with PLASCON WOODCARE KNOT SEAL (PK 2). Then prime with PLASCON WOOD PRIMER (UC 2). N.B. WOOD PRIMER may be omitted for interior surfaces.

1.3 Hardboard: Prime with PLASCON PLASTER PRIMER (UC 56).

1.4 Mild steel: Degrease with PLASCON AQUASOLV DEGREASER (GR 1) and rinse thoroughly with water. Remove any rust by coarse sanding, mechanical grinding or with PLASCON RUST REMOVER (RR 1). Prime general surfaces with PLASCON METAL PRIMER (UC 501). Use ZINC PHOSPHATE PRIMER RED OXIDE (UC 207) for structural steelwork. N.B. Mill scale must be removed by abrasive blasting or mechanical grinding before coating.

1.5 Galvanised steel: Clean with PLASCON GALVANISED IRON CLEANER (GIC 1) and rinse thoroughly with water to achieve a water break-free surface. Remove any red rust with scouring pads or sanding back to bright metal. Spot prime areas where rust has been removed with COASTCOTE ETCH PRIMER RED OXIDE (SNK 2) or PLASCOSAFE 18 PRIMER (EMS 18). Prime the entire surface with PLASCON GALVANISED IRON PRIMER (GIP 1).

N.B. When overcoating water based primers with solvent based topcoats, allow a 24 hour period for drying and curing.

2. Previously Painted Surfaces:

2.1 Previously painted surfaces in good condition: Remove loose and flaking paint back to a sound substrate and a firm edge by scraping and sanding. Spot prime bare areas with appropriate primer. Clean with POLYCELL SUGAR SOAP POWDER solution to remove all contaminants. Rinse with clean water to remove all traces of SUGAR SOAP. Sand glossy enamel surfaces thoroughly to an even matt finish, dust off and apply one coat of PLASCON UNIVERSAL UNDERCOAT (UC 1).

2.2 Previously painted surfaces in poor condition: Completely remove paint by most appropriate means e.g. scraping, course sanding or stripping with REMOVALL ALL PURPOSE COATING REMOVER (RRA 220). Wash thoroughly with POLYCELL SUGAR SOAP POWDER solution. Rinse with fresh water. Proceed as for new work.

2.3 Chalky surfaces: Remove as much of the chalky surface as possible. Seal with PLASCON BONDING LIQUID (CVI 14) and allow to dry for 16 hours.

3. Filling:

Fill defects with POLYCELL POLYFILLA MENDALL 90, POLYFILLA INTERIOR or POLYFILLA EXTERIOR as appropriate. Seal POLYFILLA EXTERIOR with PLASCON PLASTER PRIMER (UC 56). Fill wood with POLYCELL POLYFILLA MENDALL 90 and seal with PLASCON PLASTER PRIMER (UC 56).

>> Download the Velvaglo Data Sheet <<

16 thoughts on “Surface Prep: Velvaglo

  1. Please advise whether I need to prime supawood / MDF before I paint it with Velvaglo? Or can I just paint it on the raw supawood? I’m replacing all the skirting boards in my house, so it’s all interior only. Thank you kindly!

    • Hi Sadia, thanks for reaching out to us. You can apply Plascon oil-based Velvaglo by spray. Here’s what you need to do: For spray application, thin approximately 10 parts Velvaglo to 1 part Spraying Thinners or Mineral Turpentine by volume. Please note that thinning will however destroy the non-drip properties.

  2. I’m wanting to paint a varnished bookshelf with Velvaglo. Do I need to sand it down to bare wood? And then? Primer or Universal Undercoat before painting? Many thanks

    • Hi Janet, thanks for getting in touch with us. Please note that you will first need to completely remove all traces of the varnish. If you are using oil-based Velvaglo there is no need to use a primer / undercoat. If you are using the water-based Velvaglo then you will need to apply 1 coat of Plascon Universal Undercoat followed by 2 coats of water-based Velvaglo.

  3. Hi I want to repaint skirting previously painted with PVA. If I recall correctly, it was Dulux Silk. Do I need to apply a layer of Universal Undercoat or can I use the Velvaglo water-soluble directly over it?

    • Hi Nadri, thank you for your query. Here’s what you need to do:

      1. Remove loose and flaking paint back to a sound substrate and a firm edge by scraping and sanding.

      2. Spot prime bare areas with appropriate primer. Clean with Polycel Sugar Soap Powder solution to remove all contaminants and rinse with clean water to remove all traces of sugar soap.

      3. Sand glossy enamel surfaces thoroughly to an even matt finish and dust off. Finally, apply 2 coats of Water-based Velvaglo.

  4. Hi there. I want to paint my polished oak coffee table with water-based Velvaglo (as I recall, the table is not varnished). How do I prepare the surface appropriately, and what primer should I use?

    • Hi Michelle, thanks for connecting with us. To paint your polished oak coffee table you will need to sand it down back to bare wood, dust off, and then apply 1 coat of Plascon Wood Primer. Once dry apply the waterbased Velvaglo.

  5. Hi, I’m making furniture (all for interior use) using Velvaglo water-based. I put edging on so I only paint the flat surfaces. Which primer do I need to use? I’m getting different opinions (i.e Plaster Primer UC56 or PP700 or Universal Undercoat). Another question: would there be a big difference if I only put 1 main coat over the primer with regards to quality of the product? Am just thinking budget-furniture and to save time. Most people (students) don’t have much money so I’m happy with something practical. Thank you

    • Hi Van, here’s what we advise:

      For Supawood wood (unpainted) which is manufactured wood, you must use Plascon Plaster Primer (UC56). You must also use 2 coats of the top coat to achieve the desired finish and for the paint features to apply.

  6. Hi, I want to paint my varnished skirting boards inside with Velvaglo oil based paint. Must I sand it down or can I just clean it with sugar soap and paint directly onto the varnished skirting?

    • Hi Riana, thanks for getting in touch.

      You will need to sand down the varnish, dust off and then apply 1 coat of Plascon Universal Undercoat (to prevent the varnish from bleeding to the new top coat). Let this dry for 16 hours and then apply 2 coats of the oil-based Velvaglo with a 16 hour drying time between coats.

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