Every so often, I have inquiree about a substitute for DullCote. It works well, but the small cans will eat your wallet alive if you need a lot of it.
Well, a week ago, I was at the local Hobby Lobby (no, I don't work there or even own stock) and they had a product that was from Crafts Etc. It was clear acrylic spray and was available in both the Matte and Glossy finishes.
I tried a can of the Matte. In the past, similar Matte products have still been pretty glossy; this one wasn't. It left just a faint sheen... maybe only about 20% of glossy. Anyway, I used it to seal some decals that I put on a prepainted Athearn reefer and it seems to work really well.
Now for the best news... an 11 oz. can of this stuff costs $4.47 per can... that's not a whole lot more than the cost of one of those small cans of DullCote.
As always, I'd suggest that you try it on a scrap piece of whatever with whatever kind of paint you are going to use, but my first experience with it has been very good.
dlm
--------------------------- Dan Merkel