Does this polish dry out once it is opened?

Hi... ive had mine for a couple of years now and it hasnt dried at all. I do not leave it open.longer than necessay and if it did go dry you could just warm.it up with the lid on or rub a fine layer of oil such as olive oil or linseed oil

So is it 12 tins as stated in product features pack of 12 if not you need to amend accordingly as it would be classed as false advertisement

You really are not too bright thinking it was 12 tins

Would this work on black leather football boots ?

My view is that the black polish will be fine on football boots. I use on golf shoes

Would this work on a white leather handbag after i've used methylated spirits to rmove marks and dirt, and possibly removed some colour ?

HiIt would work HOWEVER the big problem is it is shoe polish. So there is a serious risk of it coming off onto your clothes.It you could find some way of sealing it that may help