Red and Yellow marines

[Savark]

So how do you paint em'
e.g. Imperial fists or Blood angels

[Aldramelech]

I tend to undercoat white and build up the colour in thin layers.

[Shadow Queen]

I prime white then use P3's Cygnus yellow. Thats what im doing for my Scythes of the Emperor.

[VekortheBlack]

I tend to undercoat white and build up the colour in thin layers.

O yes this saves loads of time too!
If you want them to have a deeper tone prime em grey.

[zed]

for blood angels spray them mechrite red, fill in the other colours, boltgun, black etc and then spray with badam black wash. highlight back up.

for imperial fists spray elf flesh and highlight up. spray with yellow ink and then fill in all the other colours.

simple