I have just bought some new railings for my front doorstep. Simply screwing them down wont work or be strong enough. I was told there is a liquid that you pour into the drilled holes, then place a bolt into the hole where it sets solid and then the railings base plate can sit over the threads of the bolts then you put the nut on to secure them. What is this maginc liquid.... guessing something like araldite or something???