French,
To be on the safe side I wouldn't allow the hair coloring to get on the base. But that's easy enough to do since you just put the 'Back 2 Natural' on a comb and just comb it through your hair. It just takes a couple of minutes. The TL 400 will definitely be easier for you--easier attachment and removal. It will save you time. The TL 400 is very thin. It's translucent so the color of your scalp will show through. Lace and skin are two different materials each with their own characteristics. Both are excellent. We carry a narrow selection of bases because we've selected only the 'cream of the crop.' The life span of both types of units are about the same.
Regards,
John