No Nonsense Decorators' Caulk White 310ml (57568)

Hello Su85, This will be fine for your needs. The item once fully cured can be painted over and not crack as long as this is not used with highly filled emulsion. Thank you for using Screwfix Q&A. A.K.C.

Hello, Thank you for your enquiry. This product is paintable with water based and synthetic paints. It has perfect adhesion without use of primer on most substates. A joint with the correct dimensions is able to absorb movements between building materials. The joint depth should always be in the correct relationship of the joint width. A general rule is the ratio of joint depth to the width of the joint with a joint width up to 10 mm is 1:1, with a minimum of 5 mm in width and depth. For joints wider than 10 mm, the depth is the width divided by 3 plus 6 mm. Application temperature +5°C to +40°C (applies to environment and substrates). All substrates must be solid, clean, dry, and free of grease and dust. Substrates to be cleared of all loose particles, absorbent substrates do not need to be absolutely dry. Very porous substrates like: gypsum, airated concrete, limestone, etc, need to be primed with a mixture of 1 part caulk and 2 parts water. Always test adhesion prior to full application. Paintability - This product is paintable when fully dry. During curing product will show shrinkage, which can cause cracking of the paint. Paintable with water based and synthetic paints. Painting with highly water based paints can create cracking. We recommend testing compatibility with paint prior to application. The longer you can leave to dry the better as is some cases it can take up to two weeks for the caulk to fully dry.Hope that helps. Thank you for using Q&A.

Hello Jeti, Yes, this can be used around the frames of uPVC windows where it meets the wall. Thank you for using Q&A

Hello, Yes for walls certainly (although it depends on the size of the cracks). For minor/average size cracks you could liekly use this. For larger holes and cracks you're probably better off getting a masonry filler (depending on wall material). For really big cracks It would be better to consult with a tradesperson as it may be structural and could worsen over time. However, for ceilings I would recommend a light weight filler, so as not to add lots of weight to plasterboard ceiling and make it sag down/worsen the crack. Light weight filler is also great for hairline cracks in walls too. Again, for really big cracks seek help from tradesperson. If your walls are covered in cracks it may be cheaper to opt for a plaster and give the wall a skim, rather than finding every crack and using some of this. If it's your first time filling cracks/using this type of product etc it might be a good idea to do some further research online RE crack filling and products or alternatively you may wish to consult with a tradesperson. Thanks for using Q&A

Hello Mark66D, It may be advisable to contact us with further information, please use the Contact Us form below: https://www.screwfix.com/help/contactus/ Thank you for using Q&A