Originally Posted by Kristjan Flis
Okay so overall the best finish would be sprayed RS-MM on flexi white?
But the easiest would be to make a solid wall and roll on??
No...building a Frame and stretching material across it would be both easier and less expensive to make, even if the Flexi-White was used. But...if a wall could be built, it does help provide a ideal location / surface without the need of "Temporary" support. And...based on the need to stay within the upper limit of the needed Throw distance, the greatly expanded size pretty much dictates that you build and use the entire wall. More on this below.....
If so the former sounds like the better solution if its about the same price i guess.
Not unless availability and price, combined with shipping doesn't make it possible. And frankly, knowing what I do know...that you reside in OZ...that looks improbable.
What about BOC, it seems significantly cheaper, and if its being painted anyway does it make a difference?
Yes. The nature of BOC and it's type coating means that when sprayed, the initial two coatings develop what is called "Fuzzies". hair-like protuberances of paint caused by static. The resulting, uneven texture must be sanded down slightly after the 2nd coat...and sometimes just before the final coat.
With a Mortal-sized screen, this presents only a logistical addition of effort. With a 240" + diagonal screen, a veritable Herculean effort in both rolling and sanding is required. Your talkin' about needing to use a 18" roller w/a solidly built 12' Extension pole, and the BOC would have to be stretched to an extremely tightened state...and that means the Frame would have to be very stoutly braced against such tension.
Build a solid wall, and either Rolling or Spraying will become a comparative "snap", .....however Spraying will require that you create a multi-level "Walk-way". Something like a series of 4 sturdy Tables, that also has a very long, 5 Gallon Bucket supported 12" wide Plank assembly you can move into place when you need to keep on walking / spraying to the next level.
All that means having some help, and doing things in quite a organized manner.
Roll, and it can be a "One Person" job, although the idea of having one person applying paint to the Bottom half of the surface area, and another following right behind and applying paint to the Top half and blending the two edges is something that a "team' would do a lot more effectively and quickly under such circumstances.
Basically, the sheer size of what you envision doing is your biggest consideration, making even "easy" become harder than it is for normal humans.
.......sorta like a Yank tying to learn how to play a Diggerydoo.
The distance throw of ten meters gives a image size of 273" diagonal, I guess we could go this big, but i dont know if it would be comfortable to watch, and finding the material in the correct size would be very difficult wouldn't it?
Yessir, that extreme size would make the entire proposition almost untenable. Simply stated, without using a special Long Throw lens (...which would cost more than the PJ itself...) you must adapt your throw position to a practical distance. I don't know how high your Ceiling is, or if your dealing with a open Patio-type area, but if the latter is the case, you just might need to consider a rolling pedestal, and wireless HDMI sending unit.
Now that that's been said, you can consider the Optoma TH1060P, a 4500 Lumen PJ that can...get this...shoot a 217" diagonal image from 30', and give you 27 foot lambert from that position. You'd have to spend about $5-600.00 USD more, but considering that you could stick it away back in the back of the room and sold a lot of issues might well make that extra expense well worth the difference.
Even with that, and having a almost 9' high image, you gotta consider how low on the wall the image will be, and how high up the PJ must be. The aforementioned PJ has a 16" Image Offset, so the PJ's lens would have to be at 13' to allow for a 217" diagonal image to still have at at least 1 meter distance between the bottom of the screen and the Floor. You have to consider that you don't want people's heads getting in the wall.
Maybe I should investigate a super short throw, although in my experience they don't give very good image quality.
Well ok.....don't discount that. Image Quality on 1280x800 Short throw PJs is right up there these days. The Optoma TW610STi+ can give you your 200" image from 7 feet-7" You'd probably have to have a "Boom" support to hang the PJ from, but by doing that, issues surrounding screen placement on the wall, as well as any worry about "people intrusion" would vanish.
Putting together such an application can be fun & rewarding, or a nightmare of epic proportions if any important considerations are overlooked.
We / I am here to help you avoid that potential terror (ie: wasted time / cash) but ya gotta do what has to be done.