Well i havent bothered spraying the carpet as it looks like we have a clear winner already.. i dyed the carpet last weekend and about 24 hrs later there was a little bit of black dust coming off.. i the applied the VHT which looked equally promising and then work stopped whilst i attended mechanical issues.. anyway i've just gone back to the kick plate, here are the results:
Well at £10 a can for the initial one and then £7.50 ea after this was the most expensive. It was easy to apply and quite neat too. Its been sat in direct sunlight (to mimick the conditions of a car) nearly a week now and has faded quite bad to a blacky/greyish old lucking carpet, the feel too is easiest described as a teenagers sock! i have hoovered it thouroughly and had very little "colour dust" and have washed it under running water to simulate the worst conditions. It is a little softer than when tests started but the colour finish isn't the best and would require further applications. at such and expensive cost per can i think that its not really a viable option due to the poor textured finish.
at around £25 for 5 ltrs (been advised that most medium sized cars take around 3ltrs to cover) this is probably the cheapest option. I diluted the dye around 2parts dye to .5 water and applied via household sprayer (99p type from most diy places) after spraying i worked in with a brush and applied quite heavily and it went a lovely jet black. After 24hrs it was bone dry but when wiped by hand there was a noticeable amount of "black dust" on the hand. a little dissapointing considering the finish. anyway it has also been sat in the sun behind glass for a week too. I have just gone to it and wiped it by hand, very little "dust" after a good vigerous vac i wiped it again and got no "dust". It has just been washed under running water and the initial run off was slightly tinted however cleared quickly. when wiped by hand wet there were a few black fibres but very little. The finish is very soft and natural to touch and still jet black. This is looking very good at the moment and i'm not expecting to get any "dust" off this time around. Once its finished drying i will wipe with white kitchen roll and then hoover again and repeat the wipe and take photos to show "dust" levels.
I have not bothered with this due to the crispyness of the VHT finish and already being aware that it will dry a little crisy and the fact that the dye looks like it will come through the tests as viable option. I have the paint so if you really want it doing i will, but unless the dye somehow falls apart under water i don't intend to do it.