Looking for a flat overcoat in a spray can that's safe to use on HO Scale models

I model in HO scale and am wondering if there are any good types of overcoat to use on models that still are availible in a spray can. I need to find a flat overcoat for a project that I am going to be starting. I would like to find something that is not to thick for my models. All the brands that I have tried start yellow after spraying or they leave white dots. NEED HELP FINDING SOMETHING THAT IS RELIABLE!!! ANY SUGGESTIONS?:question:

 

I've always had good results using Testors Dullcoat. I model in N scale and it goes on thin enough, and dries clear (no color). Never had any white dots. What have you tried?

 

I've tried normal spray overcoats like valspar

 

Testors Dullcote's the way to go. I model N-scale and it doesn't hide details, dries quickly and is FLAT.

Cheerio!
Bob Gilmore

 

Absolutely, Dullcoat. Here's an example of a freight car that started as an undecorated car about 25 years ago.

 

Never had any trouble with Dullcote. Reliable and good coverage.