Sound Blocking StP Sonora

🟤 StP Sonora (Next-Gen Door Sound Insulation)

Looking for a moisture-resistant soundproofing material that works perfectly inside doors?
StP Sonora is a next-generation multi-layer insulation designed specifically for door panels and other areas exposed to humidity.

Its polypropylene foam layer doesn’t absorb water, while a dense soundproof membrane and sticky polymer adhesive stop road and wind noise from entering the cabin — all in one easy-to-apply sheet.

👉 How much do you need?
One pack (10 sheets, 1.76 m² total coverage) is enough to:

• Treat all four doors, or

• Cover door skins and rear panels for complete noise protection.

👉 Where to use it:

• Door panels (inner and outer sides)

• Rear side panels

• Moisture-exposed areas inside the cabin

👉 How to install:

1. Clean the metal surface — remove dust, oil, and old residue.

2. Apply on top of the vibration-damping layer (e.g. StP Gold or Aero).

3. Cut to shape, peel off the protective film, and press firmly.

4. Works best above +15 °C — if cooler, lightly warm before applying.

👉 Why it works:

• 3-layer construction:

  • 2 mm heavy butyl base for vibration damping

  • 3 mm viscoelastic polyurethane foam for sound absorption

  • 1 mm polymer adhesive layer for maximum grip

• Moisture-resistant design — perfect for door cavities.

• High noise reduction at low frequencies.

• Quick installation thanks to layer-combining technology.

• Strong adhesion to metal and vibration mats.

📦 Pack Details:

• 10 sheets (each 375 × 470 mm)

• Thickness: 5.2 mm

• Total coverage: 1.76 m²

• Colour: Sand

• Airborne noise insulation index: ≥ 31 dB

• Purpose: Sound insulation & moisture-resistant noise barrier

• Installation surface: Clean metal

StP Sonora is the ideal second-layer material for door soundproofing — combining moisture protection, insulation, and vibration control in one durable, easy-to-install sheet.