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Gardening & Landscaping

Can I use weber one coat base render to smooth out existing render?

Anonymous user 09/03/2024 - 3.27 PM

I got some Weber one coat base render. https://www.wickes.co.uk/Weber-One-Coat-Base-Render---25kg/p/252325?gclid=Cj0KCQjw0PWRBhDKARIsAPKHFGiLZEn7MYODrAfwPjQS-QDdUUsiLDcWvfsd3o2ImDQSy0-rYUikBv4aAjbBEALw_wcB&gclsrc=aw.ds I have a garden wall that has a rough sand and cement render coat on it that has dried. Do i need to prime it with something before applying the coat of weber one coat on top? I want a smoothish finish that I can paint white afterwards. Do I need to smooth it out with a sponge after applying? What is the best way after applying (I assume with a hawk and trowel like plastering) Many thanks in advance.

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9 Answers

Total fencing & garden services

Rating: 5 out of 5
Downham Market
It all depends on if existing render is strong enough to take the new coat , it will need some good prep work & priming well, I would take it all down to brick and re render it personally
Answered27 March 2022
0

SAS Joinery and Building Maintenance

Rating: 5 out of 5
Nottingham
Iv not used it my self but Iv read the instructions attach to the link and it does say Not suitable for previously decorated surfaces! That’s because the old stuff might come loose and it start to peel off! So in that case I can’t advice using it! It would be best to remove the old stuff firstly then use the new render! Iv been building seating out of concrete blocks and rendering the walls with nothing but a thin one coat sand and cement to a smooth finish, a coat of pva first then floated up with a wooden float or sponge then paint with a polymer/silicone paint. Not only is it easy it’s cheap.
Answered27 March 2022
0

Chestnut paving

Rating: 5 out of 5
Oxted
I wouldn't recommend rendering over old dry render , I would hack off all old render and start again as the old will dry out the new to quickly and make it impossible to get a smooth finish. Brick/ block work should be primed before applying render in two coats, first rough coat around 4-6 mm thick with raked finnish, second coat after first has dried 4-6 mm thick. allow to partly dry out before rubbing up with a trowel and a little longer to sponge out any imperfections. Always use a metal trowel to apply,a plastic trowel to rub up.
Answered27 March 2022
0

Anonymous user

Personally I would hack it all off and start again get it straight and smooth from the word go that is essential for a quality finish
Answered27 March 2022
0

Anonymous user

Existing render are often finished with a thin coating or paint which will form a weak interface which is not suitable for rendering over.
Answered27 March 2022
0

Anonymous user

Hi yes you will need to apply pva first 1 to 5 parts water. I use a large paintbrush,making sure it's well covered everywhere. I've never used 1 coat but with general render mix,I apply with trowel from hawk. Get an evenish finish,leave to dry a bit . About an hour or so depending on weather and temperature. Then lightly run a wet sponge in one direction to illuminate any trowel marks. Hope this helps and goodluck Joe
Answered27 March 2022
0

Anonymous user

If it’s going over the existing render make sure it’s sound, meaning no loose or broken bits that are about to fall off! Then give it a key, I use a small 4 and a 1/2inch grinder with a diamond blade and score the render every 50mm or so horizontally. Only going into existing render 5mm or so! Once it’s keyed apply a strong pva and water mix, 1 part pva to 4 parts water. Use a motorised paddle mixer to mix your one coat render and apply to wall with a float as evenly as possible. Once the one coat has tacked off enough use a plastic float to finish or a damp sponge!
Answered27 March 2022
0

Paintscape

Rating: 5 out of 5
Horsham
I wouldn't recommend applying to existing render as the adhesive may not stick, I would recommend use a decorative finish that can cover existing render or remove existing render before applying the one coat render
Answered28 March 2022
0

Anonymous user

I would recomend either a base coat with a good key and then a top coat, or if the render has blown anywhere hack off the existing render and then base coat and full mesh with a good key and then apply 15mm top coat
Answered16 May 2022
0