I too can't suggest any specific brand since that may not be available in your area. I suggest look for a Acrylic Spray Varnish in nearby local store. It's a spray bottle(deodorant size bottle), which is handy and very easy to use. For more information on how to use this spray, check here.

I too can't suggest any specific brand since that may not be available in your area. I suggest look for an acrylic spray varnish in a nearby local store. It's a spray bottle  (deodorant size bottle), which is handy and very easy to use.