I have recently completed a garden bench from blockwork that was then finished with a light coloured K-Rend. The top of the bench has red cedar battens running along the top of it. After a bit of rain, I have now noticed that the tannin from the cedar has started to stain the render, what would be the best solution to deal with this: a. Is there something I can use to clean the render? b. Should I have sealed the red cedar with something previously to stop the tannin secretion? c. Should I paint over the render with something to stop the tannin seeping into it? Thanks
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