Ronseal SuperFlexible Primer & Undercoat

Our Super Flexible Primer & Undercoat helps your paint stick. Covers bold colours and blocks hardwood resins from staining your paint. Rain, snow, sun & frost make your wood swell and paint crack. That’s why you need a flexible primer & undercoat. It flexes with your wood to stop your paint cracking. And if you use it with our Weatherproof Wood Paint it’ll last for 10 years, guaranteed.

Before You Start

Make sure the wood surface to be painted is clean, dry and free from dirt, dust and grease. Put down dust sheets to cover anything that you don't want to get paint on. 

Prep - Bare Wood

Start by lightly sanding your wood. This will give it an even finish and helps the primer and undercoat to stick. Use 120grit sandpaper and sand in the direction of the woodgrain. Remember to wear a face mask. When the dust has settled, give the wood a wipe with white spirit. If you see any imperfections use our Multi Purpose Wood Filler to fill them in.

Prep - Previously Painted Wood

If your old paint is in good condition just give it a light sand to help the Primer & Undercoat stick. If it’s flaking or cracked you’ll need to sand it back to bare wood. The easiest way to do this is with an electric sander. Use 120grit sandpaper and sand in the direction of the woodgrain. It creates a lot of dust, so make sure you wear a face mask.
When the dust has settled, give the wood a wipe with white spirit. If you see any imperfections use our Multi Purpose
Wood Filler to fill them in. For bigger holes use our High Performance Wood Filler, and if any of your wood is rotten
our Wet Rot Wood Hardener will sort that out.

Using Ronseal SuperFlexible Wood Primer & Undercoat

Give it a really good stir. Then paint it on with a synthetic brush, in the direction of the woodgrain. You’ll need to put on 2 coats. Leave 4 hours between coats. After your 2nd coat give it a light sand with 240grit sandpaper. It’s now ready to paint over.

Usage Areas: All smooth outdoor wood. Don't use on rough sawn fences and sheds.
Compatibility: New or previously painted wood.
Clean Up: Clean all brushes using warm, soapy water.

How do I use it?

Areas of use: outside
Smooth Planed Wood.png
Drying time
2 Hours

It takes no time at all

Your surface area

Product reviews

Superflexible Primer and undercoat by gwyn

Woah !!! This stuff is fantastic. I haven't yet used it for outdoor wood work . . . . . but I will be doing soon. I am using it to get rid of the messy cracks that appear between the skirting boards and the walls. used quite thickly, or with numerous coats, it completely obliterates them. It feels a bit like 'sculpting' with paint to get the desired result. it may take a bit of care and patience to reach your dream finish - But the effort is worth it. And it is a complete joy to use!!!!!

Date submitted by: 28 May 2015

Brilliant stuff by Wood filler

Just finished refurbishing my sash windows, one of them had some major wet rot so i used the wet rot treatment and the high performance wood filler, this stuff is brilliant, easy to use, dries very quickly and gave a perfect finish. excellent stuff

Date submitted by: 27 April 2015

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