Overview
Built for the job.
2-in-1 primers are a specialty coating designed for easy and convenient priming of metal and plastic parts. These primers help prevent rust and seal out moisture, while providing a smooth base for topcoat application on metal substrates. 2-in-1 primers also have excellent flexibility and adhesion properties that…
TRANSTAR® 4603 2‑in‑1 Primer is a ready‑to‑spray aerosol primer designed for fast, high‑quality surface preparation in collision repair. It combines adhesion promotion and sanding capability in a single application, making it ideal for panel repair, filler sealing, and basecoat preparation on a wide range of automotive substrates.
Key technical advantages include a flash time of 5–10 minutes and a sandable window of 15–20 minutes, allowing rapid progression to topcoat. The primer delivers 432 ft² per gallon at a 1 mil film thickness, providing efficient coverage while maintaining a consistent gray color for visual inspection. It is compatible with aluminum, e‑coat, fiberglass, galvanized steel, OEM paint, plastic, SMC, and other common automotive surfaces.
Safety considerations are critical: the product carries a “Danger” signal word and presents acute toxicity, respiratory, and skin hazards. Use appropriate PPE—eye protection, chemical‑resistant gloves, protective clothing, and a respirator—and ensure adequate ventilation. The flash point is 96.4 °C (‑141 °F), and the aerosol must be stored in a cool, dry place away from ignition sources.
Why Pros Choose Transtar Autobody Technology TRM
- Fast drying and flexible
- Excellent adhesion on metal or plastic substrates
- Good corrosion resistance
- Sands easily with superior fill and build
How to Use
For use on metal or plastic surfaces
- Clean and degrease the substrate. Ensure the surface (aluminum, e‑coat, fiberglass, galvanized, OEM, plastic, primer, SMC, or steel) is free of oil, wax, and loose material.
- Shake the aerosol can thoroughly; the product is ready to spray and requires no mixing.
- Apply the first coat with a smooth, even pass. Allow a flash time of 5–10 minutes.
- After flash, the coating becomes sandable in 15–20 minutes. Lightly sand if a smooth finish is required.
- If additional coverage is needed, apply a second coat following the same flash time. No further drying time is required before topcoat application.
Compatibility
Compatible substrates: Plastic.
Specifications
| Part No. | 4603 |
|---|---|
| Product Line | TRM |
| MFR Model | 4603 |
| Standard/Approvals | California Pro65 Warning: Cancer and Reproductive Harm |
| Application | For use on metal or plastic surfaces |
| Manufacturer | Transtar Autobody Technology |
| UPC | 845505000656 |
| Brand | TRANSTAR® |
| Color | Gray |
| Container Size (oz) | 20 |
| Curing Time | 15 to 20 min Dry |
| Coverage (sq-ft) | 432 |
| Mixing Ratio | RTU |
- Mix Ratio
- Ready to spray
- Flash Time
- 5‑10 min
- Sandable Time
- 15‑20 min
- Coverage
- 432 ft²/gal @ 1 mil
- Shelf Life
- 1 year
- Compatible Substrates
- Aluminum, e‑coat, fiberglass, galvanized, OEM, plastic, primer, SMC, steel
About Transtar Autobody Technology
Transtar Autobody Technology is a trusted manufacturer of professional auto body and refinish products used by collision repair shops and restoration specialists across North America.
Frequently Asked Questions
What substrates is TRANSTAR® 4603 2 in 1 Primer compatible with?
It can be applied to aluminum, e‑coat, fiberglass, galvanized steel, OEM surfaces, plastic, existing primer, SMC and regular steel.
How long does it take to become sandable after spraying?
Sandable time is 15–20 minutes.
What is the flash time before the surface becomes tack‑free?
Flash time is 5–10 minutes.
What personal protective equipment is required when using this aerosol primer?
Wear eye protection, chemical‑resistant gloves, protective clothing, and a respirator suitable for organic vapors.
What is the coverage rate for this primer?
It covers approximately 432 ft² per gallon at a film thickness of 1 mil (about 0.04 mm).
Documents & Safety
Danger – Use this aerosol only with proper protection. Wear safety glasses or goggles, chemical‑resistant gloves, coveralls or a protective suit, and a suitable respirator. The primer is toxic if inhaled or swallowed, can cause serious eye injury and skin corrosion, is flammable, acts as an oxidizer, and contains carcinogenic and reproductive hazards. It also poses acute toxicity to aquatic life. Always refer to the full SDS before use.
Why Buy from autofxmart
- Authorized distributor — authentic, factory-fresh stock.
- Fast US shipping — most orders ship within 1 business day.
- 30-day returns — buy with confidence.
- Pro-shop pricing — bulk discounts available on request.
- Expert support — questions? Email us at support@autofxmart.com.
How to apply
Steps
1Clean and degrease the surface, then scuff as needed.
2Mask off surrounding panels and trim.
3Mix to the product's ratio and strain.
4Apply 2–3 even coats, flashing between each.
5Let cure fully before sanding, buffing, or assembly.
Specifications
Full data
Frequently asked
Good to know
Transtar Autobody Technology TRM is compatible with Plastic. Always ensure the surface is properly cleaned, degreased, and sanded before application to achieve the strongest adhesion and a professional finish.
The curing time for Transtar Autobody Technology TRM is 15 to 20 min Dry. Drying and curing times may vary with temperature, humidity, and film thickness — always consult the Technical Data Sheet (TDS) for exact cycle conditions.
This listing ships Transtar Autobody Technology TRM in a 20 (CN) container. Check the autofxmart catalog for other sizes and bulk pricing.
Transtar Autobody Technology TRM uses a mix ratio of RTU. Always measure activators and reducers accurately to maintain film properties and pot life — deviating from the ratio can cause adhesion or curing problems.
Most in-stock orders for Transtar Autobody Technology TRM ship the same or next business day from our US warehouse. Expedited options are available at checkout. Freight-class items may require an additional 1–2 days for carrier pickup.
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