So, let's say I take the ASHPD out of AS...
Portals seem to work on any mostly white surface that is also mostly smooth, because those stick out the most against darkness.I don't think that surfaces are anti-portal or pro-portal because of what they are made out of, more because of how they are made.
If you have an AC-powered rifle and fire it out the window, just as much damage would be done to whatever it hits as if you fired into the floor below your feet.
Now with 100% more inline comments!
I thought the ASHPD was powered by a WWII grenade...
The grenades powered the Black Hole
I wonder where the "point of no return" is in a miniature black hole.
My Work
[spoiler]Maps:
Revenge of the Angry Turrets
Capture the Cube [Co-op]
Capture the Cube 2 [Co-op]
TPWEGTH Sample Map
Aperture Aquatic Testing Center
Aperture Aquatic Testing Center 2
Aperture Time Testing Center
ML's Halloween Trick - 1000 downloads!
ML's Halloween Treat
ML's Combination - 1000 downloads!
ML's Jailbreak Labyrinth
ML's Tricky Teamwork [Co-op]
WIP:
"Capture the Cube 3"
Workshop Maps Link: http://steamcommunity.com/profiles/76561198008890579/myworkshopfiles/[/spoiler]
What about that the "only" requirement for a portal to be conducted is for the surface to carry a certain diffuse reflectivity.
If its too reflective (water/mirror/glass) it wont work.
If it's too dark (metal, cave walls) it wont work.
If it's too bumpy (cave walls, wood, complex objects) it wont work
If the light isnt reflected evenly across the visible spectrum (having a colour) it wont work
The reason the moonpaint could be such a good conducter is that it has a certain whiteness and a certain reflectivity to it, perfect for conducting a portal.
This would mean that it would work on "any" surface, as long as it has the right colour and reflectivity.
Also moondust contains is mostly Silicon oxide, lime and quite a few other metalic oxides.
The ingredients supporting this theory would be the silicon oxide and lime, both 2 ingredients used in the white concrete.
The probable "lethality" could be explained by that because moondust particles are very sharp, like finely ground up glass, something no one's body would apreciate.
So if this theory is correct, it would work "everywhere" as long as it's used on white surfaces.
Spotlighted and over 9000 downloads!!! SP_Angrybombs
Here's my youtube & deviantart
As for the wood, in P2, there are plenty wooden surfaces, and you can't shoot portals at any.
So that's why you can't look in the operational end of the device... 
Well, P-Body did it, just a FYI
My Work
[spoiler]Maps:
Revenge of the Angry Turrets
Capture the Cube [Co-op]
Capture the Cube 2 [Co-op]
TPWEGTH Sample Map
Aperture Aquatic Testing Center
Aperture Aquatic Testing Center 2
Aperture Time Testing Center
ML's Halloween Trick - 1000 downloads!
ML's Halloween Treat
ML's Combination - 1000 downloads!
ML's Jailbreak Labyrinth
ML's Tricky Teamwork [Co-op]
WIP:
"Capture the Cube 3"
Workshop Maps Link: http://steamcommunity.com/profiles/76561198008890579/myworkshopfiles/[/spoiler]
Actually, those checkered wall pieces you shoot at in
