Cement Sheet Flooring

I had an idea today when I was laying my cement sheet for under my slate tiles. I won't get a chance to lay the tilles for quite a while due to reno girls tight finances. So Someone said, just seal them till then. So I had the thought, can I actually paint (and patch the joins), then seal cement sheet on a kitchen and bathroom floor to look "decent" till I can afford to have my tiles done?

in a single word no

I'd agree with that "no" leave the sheet as is and then give it a good sugar soap clean before you lay your tiles.