cheekygoblin

Does more than just making paint dry slower! Useful additive.

Can be great for fine detail work where you want paint to flow off the brush but don't want to use too much water because you'll lose opacity. A little goes a long way.

Can help smooth out chalky paints like kimera's white, yellow oxide and red oxide. This is because it acts as a coalescent aid, meaning the pigment forms a uniform suspension with the acrylic medium.

Helps keep the needle wet when airbrushing. Less clogging.

Retarder additives/ mediums and slow-dry additives / mediums are pretty much propylene glycol, sometimes with some acrylic medium or water added. It's very cheap on ebay because people use it to make vape fluid. If you use this additive a lot it's worth the investment. Ethylene glycol works too but is slightly more toxic (tastes sweet but don't eat!). Some people recommend glycerol / glycerine as a retarder additive but it is too powerful and can prevent paint from drying for hours / days depending on the environment.

Poor coverage. Cheap, glittery appearance. Uses mica, not aluminium (or another metal) powder. Two thin coats metallics have much better options for gold.

The 'Eavy Metal team originally used a 1:1 mix of nurgling green and deathworld forest to basecoat death guard. Death guard green is that same mix.

Similar in tone to citadel thousand sons blue but has significantly greater coverage.

Blue-leaning green pastel color. When very thin works great as a final edge highlight for thousand sons armor or blue with green undertones.