Which primer should I use on bare metal?

The best choice for bare metal is an epoxy primer, as it provides reliable anti-corrosion protection and excellent adhesion. Acrylic primers can also be used in some systems but they do not replace epoxy primer when maximum protection of uncoated metal is required.

Can I apply acrylic primer over old paint?

Yes, 1K or 2K acrylic primer can be applied over an existing paint layer, provided the surface is properly sanded and degreased. This ensures good adhesion and reduces the risk of peeling or delamination of the new coating.

What is the difference between 1K and 2K clear coat?

1K clear coat is a single-component product that air-dries and is suitable for small repairs and quick jobs. 2K clear coat is a two-component system (clear + hardener) that offers significantly higher hardness, gloss and durability, and is commonly used in professional body shops.

Do I need a filler primer if I already used epoxy primer?

In most cases yes. Epoxy primer provides corrosion protection and adhesion, but it does not fully level the surface. A high-build filler primer is recommended to fill sanding marks, small scratches and pores, and it can then be sanded smooth before basecoat application.

Can I paint without using a sealer primer?

It is possible to paint without a sealer primer, but using a sealer helps to even out the color of the substrate, improve basecoat adhesion and reduce the risk of patchy areas or bleed-through. For a professional finish, a sealer is not strictly mandatory, but highly recommended.

Which clear coat is best for basecoat systems?

For modern basecoat systems, a 2K polyurethane clear coat, preferably HS or UHS, is recommended. It delivers maximum gloss, UV resistance and chemical durability, which ensures a long-lasting and premium-quality finish.

How long does it take for clear coat to fully cure?

Curing time depends on the product and conditions. 1K clear coats usually reach full dry within 12–24 hours. 2K clear coats generally cure within 24–48 hours, but their full hardness and chemical resistance are typically achieved after about 7 days under normal conditions.

How can I avoid orange peel when spraying clear coat?

To minimise orange peel, you should correctly adjust spray gun pressure, use the appropriate reducer or thinner, maintain the correct spraying distance and speed, apply the clear coat in two even coats without over-drying the first one, and keep booth temperature in the recommended range of approximately 18–25°C.

Can I mix clear coats and hardeners from different brands?

Mixing clear coats and hardeners from different manufacturers is not recommended. Each brand uses its own resin and hardener chemistry, and incompatibility may lead to clouding, separation, extended drying times or various surface defects.

How should automotive primers and clear coats be stored?

Primers and clear coats should be stored in tightly closed original containers, at temperatures between +5°C and +25°C, in a dry, well-ventilated place away from direct sunlight, heat sources and open flames. After opening, it is advisable to use the product within several months, following the manufacturer’s recommendations.

Automotive primers and clear coats are the foundation of a durable and visually appealing paint finish.
They determine how long the coating will last, how well it will adhere, and how resistant it will be to environmental and mechanical impact.
In this article, we will explore the main types of automotive primers and clear coats, their purposes and features, and how to choose the right products for your project.

🔹 What Is an Automotive Primer and Why Is It Needed?

An automotive primer is the first layer applied to metal, plastic, or filler before painting.
Its primary purpose is to ensure adhesion, protect the surface from corrosion, and create a smooth, uniform base for further coating application.

🔧 Main Types of Automotive Primers

1. Acrylic Primer

The most commonly used primer for bodywork repairs.
Offers excellent filling properties, quick drying, and easy sanding.
Ideal for leveling minor imperfections before painting.

Advantage: versatile — can be applied over filler, metal, or old paint.

2. Epoxy Primer

Designed for corrosion protection on bare metal.
Provides exceptional adhesion and high chemical resistance.
Frequently used as the first layer on sanded or blasted metal surfaces.

Best for: restoration work, classic cars, and surfaces exposed to moisture.

3. Filler Primer (High-Build Primer)

Used to fill surface imperfections, scratches, and sanding marks.
Applied in several layers and sands easily.
Creates a perfectly smooth surface before applying basecoat.

Recommendation: combine with epoxy or acrylic primers for best results.

4. Sealer Primer

A thin, uniform layer applied directly before basecoat.
Improves adhesion, evens out surface color, and prevents spot absorption.
Often used in professional painting systems such as Siro or Mondial Color.

💎 Automotive Clear Coats — Protection and Gloss

A clear coat is the final protective layer that provides gloss, UV resistance, and protection from chemicals, scratches, and weather conditions.
A high-quality clear coat is essential for long-lasting shine and durability.

Types of Automotive Clear Coats

1. Acrylic Clear Coat (1K)

Single-component clear coat.
Ideal for small repairs and quick applications.
Air-drying, does not require a hardener.

Benefit: simple and convenient, but not as durable as 2K clear coats.

2. Polyurethane Clear Coat (2K)

Two-component system: clear coat + hardener.
Ensures high hardness, excellent gloss, and extended durability.
Widely used in professional body shops.

Example: Siro 2K HS / UHS clear coats offer exceptional gloss and weather resistance.

3. HS and UHS Clear Coats (High Solid / Ultra High Solid)

Higher solids content means denser coverage and reduced consumption.
Provides a deep “mirror-like” gloss.
Delivers premium-quality finishes.

Recommended for: full resprays, high-end detailing, and professional refinishing.

4. Matte Clear Coats

Used to achieve satin or matte finishes.
Popular for tuning, custom projects, and modern matte automotive colors.
Can be mixed with glossy clear to achieve different levels of sheen.

🧰 How to Choose the Right Primer and Clear Coat

Assess the condition of the surface.
New panels can be primed with acrylic primers; rusted or sandblasted surfaces require epoxy.
Consider the type of paint.
Acrylic paints work with acrylic clear coats; basecoat systems require 2K polyurethane clear coats.
Think about operating conditions.
Vehicles exposed to constant UV light need a clear coat with UV-resistance.
Do not compromise on quality.
Primers and clear coats form the foundation and protection of the entire coating system — their quality determines the finish longevity.

🏁 Automotive Primers and Clear Coats from TOPHIM GROUP

Our assortment includes primers, clear coats, and professional refinishing materials from Siro and Mondial Color — brands known for:

stable and repeatable quality,
excellent adhesion,
high gloss and durability,
affordable pricing directly from the distributor.

📍 Learn more at tophim.com.ua or contact our specialists for recommendations tailored to your project.

Automotive Primers and Clear Coats: Types, Features, and How to Choose the Right Ones