As long as the existing dash finish is sound and not boast, remove as much old stone as possible and this will give you a good key to render onto. Best basecoat to use will be HP12 basecoat then if hand applying the silicone FT k rend.
hi markie,
give me a call to discuss your project - 02828 260766
k rend can offer you a range of external finishes suitable for blockwork - may be worth your while checking out our website to see if you would like to receive any samples of the finishes available.
As outlined in the application instructions krend should not be applied under 5 degrees celsius. krend also offer an accelerator now to help speed up the curing process hence this may be worth noting on your next job since this will help you scrape the render quicker than in normal conditions.
onto brick and block you would be best advised to use a polymer basecoat with a mesh embedded in this - this will help reduce cracking and help to strengthen the render. there will not be a significant difference between using k rend and sand and cement - long term you will have to paint...
it is possible to over-coat existing krend with another thin layer of k-rend - using our R7 acrylic bonding aid.
however, rendering onto a substrate such as a render carrier board this may not be possible since this type of render carrier may not be able to hold the additional weight of the render.
krend onto existing brick - is always best to clean surface & any algae first, then apply the R7 acrylic bonding aid, HP12 (AND OR HPX base if you prefer) before application of your silicone topcoat.
all K rend specifications for scraped textured renders outline that after applying the silicone FT (final coat) that you should 'rule to line and level and allow to set' , before scraping. this helps to eliminate the chances of large tolerances in the surface of the render when complete.
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