Siless Liner 157 mil 36 sqft Aluminum Foil Car Sound Deadening - Heavy

In this review the Siless Liner 157 mil proves to be a practical choice for DIYers and professional installers who need a thin, waterproof thermal and sound barrier for vehicles. The reviewer found the product delivers its main promise: a lightweight, closed cell PE foam with an aluminum finish that noticeably reduces radiant heat and road noise while remaining easy to trim and apply. For anyone fitting firewall, floor, trunk, or roof panels and looking for good value per square foot, this liner balances performance and cost effectively.

Key Features

• Closed cell foam: The waterproof closed-cell polyethylene construction prevents moisture absorption and keeps insulation performance stable over time.
• Aluminum finish: The reflective alufoil surface serves as a radiant heat blocker, helping to cut down engine and exhaust heat transfer into the cabin.
• Self-adhesive backing: The peel-and-stick adhesive layer simplifies installation on metal panels and contours, allowing work with or without a roller.
• Vibration deadener: The 4 mm thickness and compressible foam help dampen vibration and reduce mid-to-high frequency noise from panels.
• Lightweight and flexible: At 36 ft2 per roll and a roll size that is easy to handle, the material is simple to cut, position, and conform to irregular surfaces.
• High temperature tolerance: The foam's operating temperature matches rubber foam up to about 215 F, making it suitable for many engine-bay adjacent applications.

Who It's For

This liner is well suited to car owners, audio installers, and body shop technicians who want a cost-effective thermal and acoustic layer that is easy to trim and apply. It works for trunk floors, doors, roofs, and floor pans where a thin, waterproof barrier and some vibration damping are required.

It is less appropriate for someone who needs heavy mass-loaded sound deadening for deep bass control or who requires a multi-layer acoustic assembly as a single solution; in those cases pair this liner with denser deadening mats or damping sheets for best results.

Pros & Cons

Pros

• Effective radiant heat reduction from the aluminum foil surface for cooler cabin temperatures.
• Waterproof closed-cell foam that does not absorb moisture and has no odor, keeping installations clean.
• Easy to cut and apply with the self-adhesive backing and flexible roll format.
• Good value per square foot compared with higher-priced liners with similar characteristics.

Cons

• Adhesion reports are mixed; while many users find the adhesive grips well, some installations may require extra pressure or a roller for full contact.
• At 4 mm thickness it improves mid/high frequency noise and radiant heat but may not replace heavier damping materials for low-frequency noise control.

Specifications

Material	Closed-cell polyethylene foam with aluminum foil
Thickness	157 mil / 0.157 in / 4 mm
Coverage	36 ft2 per roll
Roll size	15.74 in x 330.7 in
Mounting	Self-adhesive backing with waterproof glue
Temperature tolerance	Up to approximately 215 F

Our Verdict

The Siless Liner 157 mil is a solid, economical choice for those who need lightweight, waterproof thermal insulation and modest vibration damping in automotive applications. It offers excellent value per square foot, is easy to work with, and reliably reduces radiant heat and mid-range noise; installers should be mindful that adhesion can vary and that very low-frequency noise may require supplemental materials.

Frequently Asked Questions

Is this liner waterproof?
Yes, the closed-cell PE foam and waterproof adhesive mean the material does not absorb moisture and is suitable for damp environments.

Can I cut and shape it easily?
Yes, customers report it is simple to cut to size with a utility knife and to conform to panels by hand or with a roller.

Will this stop all road noise?
The liner reduces radiant heat and dampens vibration and mid/high frequency noise, but for deep bass or low-frequency noise additional heavier damping layers may be needed.