how do you take apart turn signals to paint the inside???

They don't make black turn signals for my truck, 06 tundra double cab. You can buy the black headlight/turnsignal as a kit, but I only need the turn signals. I took apart my headlights by heating them in the oven and then painted the inside. I've tried to heat the corners/turn signals and cannot get them apart using the same oven method. They are plastic welded/glued together and wont come apart. I bought aftermarket corners thinking maybe they use the same type silicone as the headlights, but they wont come apart either. This guy obviously figured out how to do it. He's in  and I emailed them through their site. The guy that responded said they are in fact painted on the inside and he would forward the owner my email, but I haven't heard back yet. Does anyone know how?
 
Thanks
 

his name is chris, try here....  http://www.myspace.com/thegoodlife7   

thanks. I'll try that.