wizi 0 Report post Posted March 14, 2013 Does anyone recommend using a sealant to paint the HDB toilet pipes before boxing up? I am tiling up the gypsum boards but will be having access grills made under the gypsum boards to access the pipe valves if needed. But I worry that with time and humidity, mould will accumulate in the pipes.Will painting the pipes with sealant help avert mould and bacteria? Share this post Link to post Share on other sites