Painting model kits: acrylic vs enamel vs lacquer, primer, brushes and ventilation

TUREFF• •0

Paint is where a model comes alive, and it is also where the choices multiply. This guide explains the three main paint families, why primer matters, how to choose brushes, and how to stay safe with solvents.

The three paint families

Acrylics

Usually water-based, though some modelling acrylics use alcohol or other solvents. Check the label.
Dry quickly, have low odour and clean up easily, which makes them the common first choice.
Can be less tough on bare plastic, which is why primer helps.

Enamels

Solvent-based paints thinned with white spirit or the maker's thinner.
Dry slowly, which gives a smooth finish when brushed and time to blend.
Need good ventilation and take longer before you can handle the model.

Lacquers

Thinned with strong solvents and dry very fast to a hard, durable finish.
Mostly used through an airbrush, and favoured for metallic finishes and tough primers.
Have the strongest fumes, and spraying them indoors demands serious ventilation and respiratory protection.

Mixing families

Paints can be layered, but a stronger solvent can lift a weaker paint beneath it. A common rule of thumb is to put the hottest solvent at the bottom: lacquer primer, then acrylic or enamel colour on top. Test a combination on a spare part before trusting it on a model.

Why primer matters

Primer gives the colour coat something to grip and shows up flaws, such as seams and scratches, before you commit. It also evens out plastic of different colours.

Spray can primer is quick for large areas. Spray outdoors or in a booth vented outside, in short passes.
Airbrush primer gives thinner, more controlled coats.
Brush-on primer works but leaves more texture.

Light grey is a neutral start. Black helps darker or metallic finishes, and white helps bright colours such as yellow and red.

Brush painting well

Buy a few decent brushes rather than a big cheap set: a fine round for detail, a medium round, and a flat for larger areas.
Thin the paint so it flows smoothly. Two thin coats beat one thick one.
Keep paint off the ferrule, the metal sleeve, to keep the tip sharp.
Use a wet palette for acrylics to keep paint workable longer.
Clean brushes straight away with the right cleaner for the paint, then reshape the tip.

Ventilation and protection

This is the part people skip, and should not.

Read the safety data sheet for every paint, thinner and cleaner. It lists the hazards, the solvents and the protection the maker recommends. Many suppliers publish them online.
Ventilate whenever you use solvent-based products. An open window helps; extraction that pulls air away from you and vents outside is better.
Spraying creates a mist of paint and solvent that you can inhale, even with acrylics. A simple dust mask does nothing against solvent vapour.
For solvent-based paints, especially lacquers through an airbrush, use a properly fitted respirator with combination filters for organic vapours and particles, chosen according to the safety data sheet. Replace filters as the maker recommends; smelling solvent through the mask means it is not working.
Wear nitrile gloves with solvents, and eye protection when spraying or decanting.
No naked flames near solvent-based products, and store them tightly closed in a cool place away from children.
Do not eat or drink at the painting desk.

Handling and drying

Hold parts with clips, crocodile clips on sticks or a handle made from a cocktail stick and putty. Leave paint to dry fully before masking or handling. Drying times vary widely; check the label and allow extra for enamels and in cold weather.

Where to start

Many beginners start with water-based acrylics and a brush, and move to an airbrush and other paint types once confident. There is no wrong path, as long as safety comes first. Which paints do you use and why? Share your experience or questions in the comments.