Thanks for your reply. I tried merging down but it changes the appearance of the paint. I'm not sure how to create masks or anything as, when I select the layers, the mask options are greyed out.

I'm running Win 10 Pro 32GB RAM Intel Core i7-4790K CPU @ 4.00GHz Nvidia GeForce GTX 1660 Ti

My DA Gallery: glen85.deviantart.com/gallery

Peace, love and polygons!