hi all, i need to conceal two 15mm(grey plastic) hot/cold water pipes, which are running down from ceiling to kitchen sink area. The wall is interior single block, i've dot and dabbed up to pipe work which is now just below the level of the plasterboard. Question is can i just conceal these pipes in a sand and cement mix or even dry wall adhesive,,,,, then carry on skimming straight over that or will there be a problem with condensation. is there a proper way to do this?