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Problem with gels

Hi guys, i'm pretty new to mapping and to Hammer. However, I've been having some issues with gels and droppers.

I have read the tutorial in this page:
http://developer.valvesoftware.com/wiki/Gel_(Portal_2)
I did exactly as it says there, I've also seen tutorials on youtube and i still have no idea why i can't get the gels to work properly. I have set allow paint in map to "yes", i have put lights on my map and made sure to run RAD on fast or normal. When i compile the map and test it i can see the gel falling, but it doesn't paint the floor or wall, but it is there, because if i go where the gel fell i can jump higher.
I'm following all the steps, why the gel doesn't paint anything?

If you upload your vmf I'll take a look, but it sounds like it should be working. Are you sure you have done all the things you said you did?

yes i'm sure, how do i upload it?

When posting there should be a little tab saying 'upload attachment' if you don't see it make sure you are on full post mode.