Here's "Mud" in your eye.
First...forget Spandex. You do not have the lumen output to use any surface that is at / below 1.0 gain.
S-I-L-V-E-R is a simple Mix, that consists of 90% Behr Faux Glaze to 10% (max) Liquitex Silver Metallic
ie; 1 gallon of Behr Faux Glaze + 12 oz Silver Metallic mix up 2 separate mixes 1/2 Gallon of FG & 6 oz Silver Metallic oe mix it all in a 2 Gallon container.
You'll need at least 3/4 or a bit more of that amount to accommodate the 8-9 Duster Coats required.
Here is a link to a dedicated Thread on a 225" S-I-L-V-E-R Drywall screen:
...and the follow-up thread:
Now on to spraying...............
The paint is applied in a very rapid but even manner in parallel rows, and from a distance from the paint'able surface of 14", each row overlapping the preceding row by at least 60-70%
The mix absolutely must be diluted with an additional 20% distilled or filtered water that is thoroughly mixed in using an efficient "Turbine Type" Drill powered mixer (on low speed) called a "Squirrel Mixer"
After mixing, the paint must be filtered using a 1 Gallon "Nylon Sock-style" strainer..... http://www.tools2parts.com/Trimaco-11522-p/3655-6926.htm?gdftrk=gdfV21593_a_7c1384_a_7c4726_a_7c3655_d_6926
These can usually be found at Home Depot or Lowes, though strangely enough I have never found them at dedicated paint stores. In any case, you have a link to a source whose price w/free shipping makes it a easy acquisition.
I'd like to pass muster on specifically what type HVLP Guns you own, and if they are Compressor driven, what the Tank capacity is. Also to know if you have Water / Rust Filtration. Capacity and the subsequent ability to maintain a constant pressure level "AT ALL TIMES" over a span of 4minutes...which is about how long the Gun's trigger will be depressed when spraying onto as large a surface as your contemplating.
It is an actual fact that even with my own 32 Gallon Tank, and Ingersoll Rand HVLP Gun...I could not have managed the above specified ability. I dare say, had not the Wagner control spray come into the "picture"...the "S-I-L-V-E-R picture" would not have come into being. The alternative to a conventional HVLP Gun has never come around less expensive than this:
..........well actually, within the related SF threads is a link to the same Gun @ $39.95 w/free shipping. Looking just now...I found it.
Review the above links and make your due considerations known...and we'll proceed from there.