---
title: "DIY Polyurethane Lining Method: Step-by-Step Guide and Nuances"
description: "A detailed guide to DIY polyurethane lining: hardness selection, surface preparation, installation. Specific figures and material comparisons. Learn more!"
lang: "en"
date: "2026-10-24"
canonical_url: "https://timol.com.ua/en/statti/metod-futerovki-poliuretanom-sdelay-sam"
---
# DIY Polyurethane Lining Method: Step-by-Step Guide and Nuances

A production unit worn out after just a month, another downtime due to punctured rubber or chipped steel lining is a familiar situation for an engineer or mechanic. Switching to polyurethane lining can extend the service life by 10 times and allow repairs to be done independently. Below is a guide on how to organize polyurethane lining using the DIY method: material selection, base preparation, casting technology, installation, and maintenance nuances.

## What is Polyurethane Lining and When is it Appropriate to Use

Polyurethane lining involves applying a protective layer of cast polyurethane to a working surface to enhance wear resistance, protect against corrosion, and reduce noise and vibration levels. This method is widely used in the mining, metallurgical, and machine-building industries for lining gravity equipment, concrete mixer scrapers, screen sieves, guides, bucket elevators, and other units operating under abrasive wear conditions.

Compared to steel or rubber, polyurethane provides up to 10 times the lifespan. The lining process can be organized directly at the enterprise if the technology is followed and the material is correctly selected. This is especially relevant for standard-shaped units or urgent repairs.

Polyurethane-lined parts work effectively in units where abrasives are present (e.g., bulk materials, gravel, ore), as well as where metal protection from corrosion or impact load damping is critically important. Thanks to the free casting technology, polyurethane can be applied to complex geometries and large areas, expanding its application scope.

## Selecting Polyurethane Hardness: Task and Load Considerations

For lining against abrasive wear, polyurethane with a hardness of 80-95 Shore A is optimal. This range combines high elasticity with sufficient rigidity to absorb abrasive impacts and prevent groove cutting. Excessive hardness (Shore D) is unsuitable for abrasive lining, as the material becomes brittle, leading to chipping and accelerated wear.

TIMOL's polyurethane hardness ranges from 50 Shore A to 70 Shore D. For most linings, the upper Shore A limit is chosen: for example, lining sieves, scrapers, guides, and buckets. If a unit operates under heavy dynamic loads, polyurethane with 80-95 Shore A elasticity better distributes impacts and maintains integrity even under peak loads.

Products for minor sealing or requiring flexibility (seals, gaskets) are ordered in the 70-90 Shore A range. Hardness selection is always agreed upon based on specific loads, abrasive type, and operating temperature. Precise selection is possible when ordering to a drawing ([more details in the catalog](/katalog)).

## Surface Preparation: Key to Long-Lasting Adhesion

Reliable adhesion of polyurethane to metal or other bases is the main factor determining the lining's lifespan. Poor surface preparation leads to delamination even of the best material. The surface must be cleaned to a metallic shine, removing rust, old coatings, and grease. Optimal preparation involves shot blasting or coarse grinding.

Next, the base must be degreased (acetone, isopropanol) and not touched by hands. Special two-component primers are used for polyurethane, applied in a thin layer. After the primer dries, polyurethane is cast. It's important to control the room temperature and prevent dust or moisture from reaching the primed surface.

> **Engineer’s Tip:** Always ensure a polyurethane layer thickness of at least 8-10 mm for abrasive unit lining. A thinner layer doesn't reveal the material's potential and is quickly penetrated by abrasives. Before casting, ensure the primer is completely dry and the surface hasn't been touched by hands.

## Step-by-Step DIY Polyurethane Lining Procedure

Performing lining independently consists of sequential steps:

- Dismantle the unit, completely clean off old material, rust, and dust.
- Shot blast or mechanically clean to bare metal for maximum adhesion.
- Degrease the base, then avoid touching the surface.
- Apply a polyurethane primer, wait according to instructions (usually from 30 minutes to several hours).
- Set up a mold or restrictor for casting. Molds are made of steel, aluminum, or dense silicone, based on the unit's geometry.
- Cast polyurethane using the free casting method. Distribute the material evenly over the surface, avoiding air bubbles.
- Cure the product at a temperature not lower than 18-22 °C for at least a day to gain strength and complete polymerization.
- Remove the mold, visually inspect the casting quality, trim excess, and grind sharp edges if necessary.

For complex units or large parts, it's recommended to order lining application at the TIMOL factory according to drawings, ensuring precise geometry and maximum adhesion quality. Send drawings or samples to the [polyurethane products catalog](/katalog) for calculation.

## Comparative Table: TIMOL Polyurethane vs. Alternative Materials

Below is a table with abrasion (DIN 53516) and working temperature for key lining materials:

| Material | Abrasion DIN 53516 (mm³) | Working Temperature (°C) |
|-----------------------------|--------------------------|-------------------------|
| Polyurethane (TIMOL) | 20-45 | -60...+100 |
| SBR Rubber | 100-200 | -40...80 |
| NBR Rubber | 80-150 | -30...100 |
| Natural Rubber (NR) | 60-130 | -50...70 |
| Caprolon | 30-90 | -40...100 |
| Structural Steel |, | -40...500 |

TIMOL polyurethane shows abrasion of 20-45 mm³, meaning wear resistance is 10 times higher than rubber. The working temperature range from -60 to +100 °C allows the lining to be used in most industrial conditions, including sites with temperature fluctuations and high humidity.

## Installation, Operation, and Maintenance of Lined Units

After the polyurethane layer polymerizes, the unit is returned to its regular place using standard fasteners, bolts, clamping plates, welded or threaded flanges depending on the equipment type. For bucket elevators or screen sieves, threaded or bolted fasteners are often used, while clamping plates are used for casing linings. It's important to avoid point impact loads on the lining edge.

Maintenance of the polyurethane layer involves periodic visual inspection: checking the surface condition, presence of delaminations, or local damage. In case of local defects, repair is possible with spot casting (restoring the damaged area without removing the entire layer). Thanks to wear resistance 10 times higher than rubber, full lining replacement is rare, and service planning can be done in advance without emergency stops.

Detailed information on polyurethane properties, temperature regime, elasticity, and other characteristics is available in the [reference section](/informatsiya).

## DIY Technological Nuances: When It's Beneficial and When to Order from the Factory

DIY lining is justified for units with simple geometry and small areas: scrapers, guides, small plates, buckets. Such work can be done in workshop conditions with minimal special equipment. It's important to strictly follow surface preparation technology and temperature regimes to avoid delamination.

For large, complex units or where geometric precision is critical (e.g., screen sieves with fixed seating dimensions, long casing linings), it's better to contact the TIMOL factory. They use professional casting equipment, temperature and humidity control, automatic component dosing, and specialized molds. This ensures adhesion quality, absence of defects, and precise dimensions according to drawings.

## Advantages of Polyurethane Lining: Economics and Long-Term Operation

Replacing rubber or steel lining with polyurethane allows for reduced downtimes, decreased maintenance frequency, and repair costs. One-time lining expenses quickly pay off by increasing the inter-repair resource by 10 times. The polyurethane layer retains elasticity and integrity even under short-term peak loads or moisture exposure.

Besides wear resistance, polyurethane significantly reduces noise compared to steel, doesn't transmit vibration to the supporting structure, enhancing equipment operation comfort and safety. With proper surface preparation and casting technology adherence, the lining withstands the full working cycle of the unit without delamination and repair.

## Conclusion: When to Choose Polyurethane Lining and How to Order

DIY polyurethane lining is a real way to extend a unit's lifespan by 10 times compared to rubber, reduce emergency stops, and optimize repair costs. For simple parts, this operation can be done independently by following surface preparation recommendations, hardness selection, and temperature control. For units with complex geometry or large areas, it's advisable to contact TIMOL specialists who will help select the material, calculate layer thickness, prepare the surface, and perform quality lining according to drawings. Contact technologists, place an order, or get a consultation through the [website form](/contacts) or in the [polyurethane products catalog](/katalog).