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Discussion Starter · #1 ·
Here's the setup:
http://mysite.verizon.net/vze3svsf/a...gin_screen.jpg


EDIT: That's a can of Benjamin Moore's Super White Semi-gloss latex (in case none of you viewing this post saw my other thread) and a cambpell Hausfeld Easy Spray model HV1001 and a 96"x48" MDF board.


Here's my first coat ever with a spray gun:
http://mysite.verizon.net/vze3svsf/alumtest/coatA.jpg



Don't mind the floor in that picture. I'm taking up these old simulated wood linoleum tiles and will be putting in a rug. :)


Hmmm, going by the Coat A picture, it looks a bit splotchy but I don't see it in person but the camera seems to be picking it up. I hope I made the paint thin enough. Going to need a second coat. I cleaned the gun while waiting for the first coat to dry. I have to tell ya it's pretty easy with this gun (like I've had experience with others :) )
 

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I also painted a sheet of MDF for my screen, but I used eggshell finish. Please tell us you're not using semi-gloss for your final finish. You will have hotspot city.
 

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Discussion Starter · #3 ·
Well, I'm trying to replicate the dull side of aluminum foil which I've tried and really like but can't seem to find a sheet metal place that carries something similar. The top coat is going to be five star liquid aluminum. It's actually brighter than Rustoleum Aluminun 7715. Using three sheets of the foil across the MDF board unless one was being anal about it you really didn't notice the hotspotting.


I'm going to replicate my experiment I did in this next picture. Using the glossy side of white poster board and the five star aluminum:
http://mysite.verizon.net/vze3svsf/a...minumpaint.jpg





My thread on this can be found here:
http://www.avsforum.com/avs-vb/showthread.php?t=571915



Anyway, the first coat has dried somewhat on the board:

http://mysite.verizon.net/vze3svsf/alumtest/coata-a.jpg (with flash)


The next two are without flash to conserve battery power:

http://mysite.verizon.net/vze3svsf/alumtest/coatA-b.jpg
http://mysite.verizon.net/vze3svsf/alumtest/coatA-C.jpg


The paint is drying very nicely. Almost time to put the second coat on.


BTW: This is a new sprayer (my first one ever) and I think it messed me up on my first use. When I was cleaning it earlier, I forgot to take the nozzle off to rinse that out, well I did that earlier and lo and behold there was a metal shard in the nozzle left over from when it was threaded by the manufacturer. Now the instructions only said to check to make sure everything was tightened so I didn't know I was suppose to take it apart and check for dangling bits left over from it's manufacture.
 

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Discussion Starter · #6 ·
Actually, I do have one question about spraying. How far should I be holding the gun from the board. I might have to sand it and give it another go since there is sporatic glossiness.
 

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I'm amazed you don't notice any hotspotting from anything similar to aluminum foil, even the dull side. Normally I'd think you would have to curve a metallic screen like this.


What was it you liked so much about the aluminum? The gain should be high (but you shouldn't need that high a gain with your projector, should you?), but the colors will be off.
 

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Magnification,


I definitely think you should speak to Tryg, and send him multiple aluminum samples when you're done. This could very well help in the CRT/Torus endeavor if it works properly.
 

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Discussion Starter · #9 ·
Quote:
Originally Posted by garyfritz
I'm amazed you don't notice any hotspotting from anything similar to aluminum foil, even the dull side. Normally I'd think you would have to curve a metallic screen like this.


What was it you liked so much about the aluminum? The gain should be high (but you shouldn't need that high a gain with your projector, should you?), but the colors will be off.


Well, heh, I have a true DIY projector. Not an LCD or CRT. It's a 5.25" triplet lens with a 14" toshiba. I'm going to be trying out my computer CRT a viewsonic G90f 19" once I get the screen done. The test shots I posted in my other thread were just wow in respects to definition and color compared to the toshiba TV. Been looking for, if needed, how to access any service menu's with the viewsonic in case I need to up the contrast on it but that's been another search in vain. No one seems to know. I even wrote to viewsonic about a week ago and still no reply.



Here's the setup:
http://mysite.verizon.net/vze3svsf/a...creentest3.jpg


Here's fairly accurately diagram demonstrating the hotspotting issue with the toshiba TV (using the aluminum foil on the 96"x48" mdf board):
http://mysite.verizon.net/vze3svsf/lens/Room3.JPG


This will give you an idea of the projection in terms of color:
http://mysite.verizon.net/vze3svsf/a...creentest5.jpg


Here's the ideal material:
http://mysite.verizon.net/vze3svsf/a...t/aluminum.jpg



The one thing I do like about aluminum paint is that it is close to the reflectiveness of the foil and its ability to handle ambient light.


Quote:
Originally Posted by Kamel407
Magnification,


I definitely think you should speak to Tryg, and send him multiple aluminum samples when you're done. This could very well help in the CRT/Torus endeavor if it works properly.


I will most certainly do that. Thanks
 

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Discussion Starter · #10 ·
Well I took a few chances and experimented. That second coat just wasn't sitting well with me. So, I lightly sanded the board and thinnned the paint more than what I was doing (for the third coat of super white) and stood further back from the board with the gun being about two or three feet away from the board. Glad I did. It looks really good and uniform now. Pics to follow.
 

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Discussion Starter · #11 ·
Here are the pictures for the third coat of super white. I'm sure you will all agree it looks pretty good now.


I'm not even going to bother to try and figure out what makes this digital camera tick anymore but in those flash pictures I'm still getting these strange dark bands which are not present at all.


With Flash:
http://mysite.verizon.net/vze3svsf/alumtest/coatC-A.jpg
http://mysite.verizon.net/vze3svsf/alumtest/CoatC-B.jpg
http://mysite.verizon.net/vze3svsf/alumtest/coatC-C.jpg


Without Flash:
http://mysite.verizon.net/vze3svsf/alumtest/coatC-D.jpg
http://mysite.verizon.net/vze3svsf/alumtest/coatC-E.jpg



Cheers

Magnification
 

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Discussion Starter · #13 ·
Quote:
Originally Posted by Kamel407
Looks Fantastic


Thanks a bunch. I was really nervous starting this whole spray paint thing since I've never done it before and thought I was going to make a right mess of things. All-in-all it's not that difficult. I don't think I could ever get a coat of paint this uniform or smooth with a roller (which is the way I was going to at first).


I'm going to give this super white a try first with my projector to see if I even need the aluminum and also just out of curiosity. I need to pick up a better filter mask anyway before I even attempt the oil paint. The mask I'm using now is a simple 2 strap filter for latex paint and I am using goggles too.
 

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Discussion Starter · #14 ·
Ah, I was so close. It was coming out pretty good but I think, because this aluminum paint was a lot thinner than the super white, I should have reduced the airflow on the spray gun. Too much paint and I was getting paint sag. Tried to lay the board down but I made it slightly worse trying to do that. Not easy moving this board alone. Well looks like I'm going to be using that other side of this board. I like the way it looks though. Going to try it out when it dries before doing the other side just to get an idea of it's performance.

http://mysite.verizon.net/vze3svsf/a.../Aluminum1.jpg

http://mysite.verizon.net/vze3svsf/a.../Aluminum2.jpg
 

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yeah, the finish looks pretty good...


however, looking at those photo's... it looks like you're going to have some huge hotspots to deal with...


and you're also going to get a color shift with that aluminum as well. it'll be interesting to see if a month or two from now you'll be happy with the viewing pleasure.
 

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Glad to see that the old ''one eyed monster'' ( 14'' tv and single lens) is alive and well!.....my first projection system many years ago.
 

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Discussion Starter · #18 ·
Quote:
Originally Posted by ziggyr
Glad to see that the old ''one eyed monster'' ( 14'' tv and single lens) is alive and well!.....my first projection system many years ago.


Yes indeed. A lot easier than building an LCD projector. Don't have to worry about proper cooling system, uv rays, LCD response time etc.. or even the setup of a CRT projector. The only achilles heel is the light output. Hence, the use of aluminum and with the right lens and TV you can have a pretty kick a$$ projector. :cool:


Quote:
Originally Posted by Kamel407
Wow I can't believe how good it looks though!
Yep. Only wish I had little more experience with paints and spray guns but I'm getting there.



Quote:
Originally Posted by pb_maxxx
yeah, the finish looks pretty good...


however, looking at those photo's... it looks like you're going to have some huge hotspots to deal with...


and you're also going to get a color shift with that aluminum as well. it'll be interesting to see if a month or two from now you'll be happy with the viewing pleasure.


I'll let you know tonight when I give it a try.
 

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Discussion Starter · #19 ·
One word: I love it. Damn, I had to sag the paint. Actually, this might not be such a mess as I had thought. When viewing the screen, I notice that along the ridges of the sags and where the paint slightly plateaus it's actually brighter than the rest of the screen. In fact, the sag locations look on par with the dull side of aluminum foil. Strange that. But I had noticed with this five star brand and the rustoleum that the surface of the paint when you first open the can is very reflective until you mix it. What I'm thinking is laying the board down and then spraying it. Theory: The aluminum will rise to the surface leaving behind the darker substrate and giving a surface on par with the foil. Any thoughts?


Oh yeah, the hottspoting. Meh, not bad at all. I'm getting the exact same results as the diagram I posted earlier in this thread. It's fine for my design and may not be suitable for others.


I'll try to post some pics of the comparison but I don't hold any hope in that with my camera.
 

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Discussion Starter · #20 ·
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