Not all assembly pastes are the same

Technical guide to choosing the right one and avoiding tire fitting errors.

Mounting paste is a technical component of the tire mounting process. It affects:

• heel-to-rim adhesion
• smoothness during heeling
• rim protection
• working speed
• end customer safety

The quality of the compound, its formulation, and the way it's applied directly impact the quality of the assembly. A proper choice helps the bead slide smoothly, protects the rim, and helps make the job quicker and safer. If your workshop still uses soap and water, generic greases, or industrial lubricants, here's why a professional compound is a more reliable solution.

Why avoid improvised solutions

• Soap and water – evaporates too quickly, does not provide consistent lubrication and can cause an uneven heel fit.
• Non-specific greases – can migrate onto the bead, causing the tire to slip or rotate on the rim.
• Industrial lubricants – are not formulated for this use and may be incompatible with rubber, wheels and TPMS sensors.

The result? Heels that don't go up properly, marked rims, difficulty during assembly, and customers who return complaining of vibrations or other inconveniences.

The cost of a professional paste is minimal compared to the value of the work and the components being worked on. For this reason, more and more workshops are choosing specific products for tire mounting.

Using a professional paste, however, is only the first step. To achieve the best results, it's also important to choose the most suitable formulation for the job in hand.

One assembly paste is not like another

Professional pastes aren't all the same, and they don't have to be. Each formulation is developed to meet specific operational needs.

For this reason, one assembly paste is not like another: apparently small differences can translate into quicker assembly, less stress on the tire, fewer marks on the rims and greater ease during bead seating.

Why we recommend BGS pastes

In our experience, BGS assembly pastes represent a practical and reliable solution for most workshop processes. The range includes two different formulations, developed to meet different operational needs.

Knowing the characteristics of each paste allows you to choose the most suitable product based on the type of tire and rim you are working on.

Black pasta or blue pasta? What's the difference?

Naturally, every workshop faces different situations. For this reason, many professionals prefer to have both formulations available, so they can choose the most suitable solution each time.

Black paste: greater hold for demanding assembly

Ideal for:

• rigid tires
• runflat
• sturdy rims
• mountings where greater grip is needed after heeling

Thanks to its more consistent formulation, the black paste maintains its characteristics for longer during assembly and, once the bead seating is complete, promotes high stability of the tyre on the rim.

BUY BLACK PASTA

Blue pasta: smoothness and delicacy

Perfect for:

• soft tires
• delicate or painted rims
• quick edits
• work on premium cars

The formulation of the blue paste favors smoothness during assembly, facilitates the ascent of the bead and helps to work more delicately on the more sensitive or particularly aesthetically refined rims.

BUY BLUE PASTA

How to choose the right BGS paste for your workshop

The rule of thumb is simple:

• Challenging assembly → black paste
• Delicate circles → blue paste
• Runflat → black paste
• Soft erasers → blue paste
• Workshops with mixed processes → both

Having two pastes isn't just a "plus," but a concrete operational advantage. Having the most suitable formulation for the type of job helps speed up the process and reduce the risk of problems during assembly.

Recommended products

BGS9382 – Professional Black Paste

BGS9383 – Professional Blue Paste

BGS4803 – Applicator brush

To make it easier for workshops that wish to keep both formulations available, there are no additional shipping costs when purchasing the black and blue BGS pastes together.

We'll conclude this special on tire mounting pastes with a short list of common mistakes: if you know them, you can avoid them.

Common tire fitting mistakes

Even when using a professional paste, some mistakes can compromise the final result.

• Insufficient lubrication : the bead struggles to rise, the tire becomes stressed and the rim risks scratching.
• Excessive lubrication : The tire may rotate on the rim during acceleration or braking.
• Uneven application : Dry areas and overly lubricated areas create uneven friction.
• Using the wrong paste : A paste that is too thin on a runflat, or too thick on a delicate rim, can make the job difficult.
• Unclean rim : Residues of old compound and dirt can hinder bead seating.

Choosing the right paste and applying it correctly are often overlooked, but they directly impact the quality of the assembly. Precise and professional work begins with these details.