The ratios for mixing it are right here on Swanny's website... it's about halfway down the page. As far as brushing it should do ok since you can brush future and it will self level, you should try it on a scrap model or plastic before you do it on a real model , although it should work... I thin mine with Tamiya acrylic thinner so if you need to thin that would work for ya...
-=edit=- oops forgot the link, here it is:
http://www.swannysmodels.com/TheCompleteFuture.html