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Stain blocking undercoat for crepi


Jackie

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Following on from my earlier post about interior crepi sticking to emulsioned ply, which it appears to do, I have another query which some kind soul maybe able to answer.

The oils in the ply seem to be coming through the emulsion and the crepi and staining the surface a light yellow in places. Sadly the crepi is white, any other colour the stain would not be seen I think. Before anyone suggests it I cannot change the colour now as it has to match the rest of the room.

I assume what I want is a stain blocker to paint on before applying anymore crepi. Can anyone recommend what I should look for on the Bricomarche, Castorama or E. Leclerc Brico, Bati, Jardi shelves. Would a crepi sous-couche do the job or do I need to ask for something special? Much obliged in advance for any response.  John not Jackie

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Hi John,

give the stained area a coat of oil based paint, either u/c or gloss. This will seal over the stain, & you can emulsion over it when dry. Sous couche or anything water based will not work, as the stain will come through again.

cheers, Richard.
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Hi again,

sorry, did not read your post properly, & now note you want to re-crepi, in this case don't use gloss because it may not stick without a sanding down, which break the sealing. U/C should be fine as long as it's oil based.

Richard
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Thanks Richard. I went to E. Leclerc today and they suggested IMPRESSION UNIVERSELLE which I will try tomorrow. It seems to be a general purpose undercoat and is, I assume, oil based as brushes have to be washed out in white spirit. Many thanks again.................John 
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I don't know if this is of any help but when we had a few problems, we used a British Company called Thompsons or Thomsons Water Seal. They have quite a few products in this range and we were in the UK and brought some over. They have an sealant for walls, a sealant for painting over and quite a few other bits and pieces, It does seem to have done quite a good job on our walls. If you are in France you might find something on the internet. Hope this helps. Keni
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Thanks for the info Keni but I have got the IMPRESSION UNIVERSELLE on the wall now so time will tell if it is any good. It is certainly quite thick and covers well. I will put the crepi on it tomorrow..................John
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