Hello Everyone

I am heading along with my 50x50 Box Section CNC and I have bought my Kiln Dried Homebase jointing sand. I was just going to use that to fill the box up but then thought that every time it comes apart the sand will leak out of the threaded holes.

I have seen that it is mixed with resin but I don't know if that is because it adds strength and dampening too. Or could I use PVA and mix it with the sand to hold it in and stop it running out, but also because I am using 3mm steel would it tap well with the resin and help with the holding too ?.

If it is resin I'm not really sure how much to order or where from ?

I guess its not possible to mix it with mortar and just make cement is it.

Thank you for any help in the right direction

thanks

Rob