S-I-L-V-E-R is a extremely light colored coating. It consists of just 6-8 oz of Silver Metallic added to a full gallon of translucent Matte Glaze.
It has to be built up over 7-8 coated layers, so the dispesion of Silver metallic will all blend together eventually.
Even so, the extra translucency of the completed coating (SF is translucent too...but not as much so as S-I-L-V-E-R ) uses the lighter background as a boost. But if that background has too reflective a surface, it's almost assured that the gloss would create a localized hot spot.
I have to say "almost" because frankly, knowing the principle underlying S-I-L-V-E-R, I have avoided messing around with anything outher than the type / amount of Silver Metallic.
So...let's say your desperately trying to avoid having to do the required Priming. Well, sanding melamine coating is / can be tricky. If you use a fine grit Sanding sponge, and sand the entire area evenly without creating any gouges or scratches, then yes...you could use something like Thrifty White Hardboard.
It boils down to a case of self-experimentation. Usually, people want a solution...something others have themselves shown and proven works. Even then, success in doing a DIY painted screen is measured in 3 parts effort and 1 part good fortune / luck, and it's a primary goal of most of us to advise DIY'ers of the well-proven way to go about it.
That said, there is always a cadre of individuals who suggest, "Why not just try this first / then that, and if you decide you like it, Great! If not, now you know what else you might want to try."
I simply cannot adjust my thinking to that....as I see far more who simply want a correct solution out of the veritable "Gate", and who also might run screaming from DIY'ing Screen making altogether if their initial bout rewarded them with poor / mediocre results, or worse, abject failure.
I've seen that happen a few times too. It's like coming upon a twisted Car wreck and the Tow Truck is already pulling it away. Not much can be done to salvage the situation at that point. All the damage is done, and the Ambulance or Hearse is already gone.
So experimentation is not for anyone who is looking for a "Gotta have it NOW!" solution. However , experimentation is also what makes for new discoveries. The other day I heard (again) a quote that said,
Most every great discovery came about because the Inventor ignored those who said it was impossible to accomplish...that science or conventional thinking would not allow such.
That sort of "Thinking with Blinders on" continues in some quarters. On this Forum, we run the Horses wholly unfettered.
So iffin' you want to try something new,and you can bear the brunt of potential failure, have at it...and whose to say otherwise that you just might show all the Old Dogs a new trick.