Felix's Hammer Notepad
modelsprops_junkmetal_paintcan001a.mdl is the one that isn't crushed. just reskin it if you want to use it for orange or any other color paint.
Aperture Science: We do our science asbestos we can!
Forgot to ask this before why isn't is workshop compatible? What are the custom particles. What even ARE particles. Sorry for being such a noob. 
Particle effects are a type of file that the game engine can use. They are basically a cluster of small objects, energy, fluids or other things that move and animate in a group. Examples of particle effects: sparks, portal gun shots/lightning, glowing flecks emitted by the excursion funnel, dust, some laser effects and gel explosions. The gel has a couple of effects it needs but valve didn't provide, which Felix has added. Source engine map files have a section of the file for custom content that the map needs, like sounds and texture. Portal 2 has a bug that prevents particles from working in this, and this is the only way to bundle files with workshop maps.
[spoiler]- BEE2 Addons | (BEE2)
- Hammer Addons
Maps:
- Crushed Gel
- Gel is Not Always Helpful[/spoiler]
Then how does it work submitting it here?
Here we can upload a zip with the particles and map file and get people to copy them into the correct places in the game files, and edit a file to get the game to search for the new particles. You could do this through the workshop, but players would still have to download manually the particle effects.
[spoiler]- BEE2 Addons | (BEE2)
- Hammer Addons
Maps:
- Crushed Gel
- Gel is Not Always Helpful[/spoiler]
Exactly. 
Also, certain effects need to be set up in the previous map (the color of the gel, for example), so I need to be able to have two maps connected to each other. If I put them on the workshop and people played them out of order, any maps with gel in them in between would be badly glitched.
How do cubes react to the adhesion gel?
Not at all right now. My plan is to make it act like Stasis Gel if the cube is also touching a purple wall. I couldn't do that normally, but if I'm going to require the player to tile the room with triggers I can do things like wall detections.
What do you mean by that I thought you HAD to tile them with triggers or did you find another way?