I've have always liked B&Q but did not have a good experience there today. I returned a small tin of their Internal and External Wood Primer and Undercoat as it was UTTER RUBBISH - I put the gloss top coat on and all the undercoat came off in clumps on the paintbrush. They would not give a refund as they stated there was nothing wrong with the paint but rather it was down to me for putting it on over an oil based gloss (they assumed it was anyway). I've used various paints over 25 years and this is literally the worst ever. I followed all the instructions on the tin. The guy then tried to tell me that B&Q paints were better in tests than Dulux. Please avoid this product at all costs as you will regret it and be out of pocket. I left the tin and the receipt at the store in Imperial Park, Bristol, in disgust.