At a Glance

> Measure First: Confirm that 1.25" width and .188" / 3/16" thickness match the gap or rail surface you are sealing.
> Surface Prep: Clean and dry the application area before installing the tape.
> Compression Fit: This tape is designed to seal when compressed between compatible surfaces.
> Check Old Tape Size: Match the existing tape width and compressed thickness before replacing.
> Check Rail Contact: Make sure the rail or mounting surface contacts the tape evenly across the full length.
Brand: LaVanture
SKU: TM125B

Before You Order

Match the part number, measurements and connection points that apply to your trailer.

Opening	Measure the existing roof or wall opening.
Flange	Confirm overall and flange dimensions.
Operation	Confirm powered, manual or fixed operation.
Mount / Power	Verify mounting and electrical requirements.

Product Details

Truck Topper / Trailer / RV Body Rail Tape

30' Mylar Black Tape 1.25" x .188" - Truck Toppers, Body Side Rails, Trailers & RVs

Black #30 Mylar tape for sealing, cushioning, vibration dampening, and sound deadening on compatible truck toppers, body side rails, trailers, RVs, and similar clean, dry light-duty substrates.

Part Number: TM125B 1.25" Wide x .188" Thick 30' Section

Key Measurements & Specs

Specification	Detail
Part Number / SKU	TM125B
Product Type	#30 Mylar body rail / sealing tape
Color	Black
Width	1.25"
Thickness	.188" / approximately 3/16"
Length Included	30' section
Material	Durable polyvinyl chloride (PVC) with polyester film backing
Adhesive	Standard G1 emulsion acrylic adhesive

Fitment / Application

Category	Details
Common Applications	Truck toppers, body side rails, trailers, RVs, and similar sealing or cushioning applications
Primary Fit	Use where 1.25" wide x .188" thick tape is required
Surface Requirement	Best applied to clean, dry, light-duty substrates
Fitment Method	Verify tape width, thickness, length requirement, surface condition, and compression area before ordering
Important Note	Application fit depends on the surface, required seal thickness, and compression area. Verify before installation.

Top Features

Feature	Buyer Benefit
PVC Construction	Formulated for durable service life in sealing and cushioning applications
Compressible Seal	Helps seal out air, condensation, light, and dust when properly compressed
Vibration Dampening	Provides cushioning, vibration dampening, and sound deadening between contact surfaces
Flexible Application	Conforms to irregular surfaces and curves when applied to a suitable clean, dry surface

Overview

This listing is for one 30' section of black #30 Mylar tape, part number TM125B. The tape measures 1.25" wide x .188" thick and is commonly used on truck toppers, body side rails, trailers, RVs, and similar applications where a compressible sealing, cushioning, or dampening strip is needed.

R&P Service Insight

Before installing body rail tape, confirm that the surface is clean, dry, and free of loose debris, old adhesive, wax, oil, or moisture. Proper prep helps the adhesive bond and allows the tape to compress evenly.

Measure First: Confirm that 1.25" width and .188" / 3/16" thickness match the gap or rail surface you are sealing.
Surface Prep: Clean and dry the application area before installing the tape.
Compression Fit: This tape is designed to seal when compressed between compatible surfaces.

R&P Knowledge Hub

Compatibility: Compatible with applications requiring black 1.25" wide x .188" thick body rail, topper, trailer, or RV sealing tape. Verify measurements before ordering.

Vehicle / System Fit: Commonly used for truck toppers, body side rails, trailer body contact points, RV applications, and general cushioning or sealing use where the tape dimensions match.

Installation Notes: Apply to clean, dry surfaces. Confirm that the tape can compress properly without bunching, folding, or interfering with panel fit.

Performance Insight: The PVC body and polyester film backing provide dimensional stability, while the adhesive backing supports light-duty bonding to suitable prepared surfaces.

Brand & Fitment Note

Selling Brand: R&P Carriages

Application Reference: Truck topper, body side rail, trailer, and RV references describe common application types only.

What This Means: This listing is for one 30' section of black #30 Mylar tape, part number TM125B. It is not listed as a vehicle-specific OEM-branded item.

Before Ordering: Verify tape width, thickness, length requirement, surface material, surface condition, and compression fit before installation.

R&P Repair Insight

When replacing old body rail or topper tape, remove worn material completely before installing the new section. Uneven old adhesive or dirt can reduce contact and prevent the new tape from sealing evenly.

Check Old Tape Size: Match the existing tape width and compressed thickness before replacing.
Check Rail Contact: Make sure the rail or mounting surface contacts the tape evenly across the full length.
Check Environment: Avoid installing over moisture, dust, grease, oil, or loose paint.

Features

Durable PVC Construction

Formulated from durable polyvinyl chloride for long service life in compatible sealing and cushioning applications.

Seals When Compressed

Helps seal out air, condensation, light, and dust when compressed between properly prepared contact surfaces.

Cushioning & Sound Dampening

Provides cushioning, vibration dampening, and sound deadening between topper rails, body surfaces, trailer surfaces, and similar contact points.

Dimensional Stability

Cast onto a 2 mil polyester film to provide dimensional stability and supplied as a self-wound product.

G1 Acrylic Adhesive

Uses standard G1 emulsion acrylic adhesive for light-duty substrates that are clean and dry.

Flexible Surface Conformity

Conforms to irregular surfaces and curves, helping support a better fit across compatible application areas.

Resistant Material Properties

Inherently resistant to fire, ultraviolet rays, most chemicals, acids, and solvents.

30' Working Length

Includes one 30' section for topper rails, body side rails, trailer, RV, and general body sealing applications where the dimensions match.

Included Components

Quantity	Item
1	30' section of black #30 Mylar tape, 1.25" wide x .188" thick
Not Included	Installation tools, cleaners, primers, hardware, or additional adhesive products

Important Fitment Note: Verify all tape measurements, surface condition, compression area, required length, and application requirements before installation. This tape is intended for compatible clean, dry light-duty substrates where the listed width and thickness match the application.

Shop Related Body Rail & Sealing Parts

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30 Mylar Black Tape 1.25" x .188" - Truck Toppers, Body Side Rails, Trailers & RVs (TM125B)