needles and different compound

[kevin]

it's necessary to switch needles between different compound? I wonder if I draw out the deca , can i use the same needle to draw out the test and then switch and shoot?

 

[anton88]

I use a needle to draw the gear and another to shoot. I don't think is a problem mixing the compound if it's in one shot

 

[spike74]

mix the compounds and take one shot so you don't have to stick yourself as much