AltroMastic-any-colour - Altrodirect
AltroMastic-any-colour - Altrodirect
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AltroMastic™ 100

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A colourful, flexible sealant for neat and durable floor edge finishing


Product description

AltroMastic 100 is the perfect, easy way to finish your installation to a professional standard and prevent moisture getting under your floor.

We offer one of the largest mastic colour ranges on the market. AltroMastic 100 is available to match or coordinate with our entire vinyl range, so you don’t have to compromise on the aesthetics of your space.

AltroMastic 100 is ideal for use in areas where your Altro flooring abuts edges, skirtings, wall surfaces etc, to form a seal between your floor and the edge. It’s easy and fast to use with a standard mastic gun.

Once used, not only will your installation look neater, but you will also be able to enjoy the other benefits that our mastics deliver. AltroMastic 100 is waterproof and lets you create a watertight system right up to the edge of your space. This sealed floor makes cleaning easier, letting you clean up to the floor edge and preventing any moisture from your cleaning getting under the flooring and causing damp issues.

Please remember, AltroMastic 100 does not replace the use of hot welded joints in your flooring installation, but is intended for use around perimeters, where hot welding is not feasible.



Where do I use AltroMastic 100?

Use AltroMastic 100 to seal joints in Altro flooring where obstructions prevent the use of a hot air welding gun. This could be where Altro flooring abuts edges, skirtings and wall surfaces or where the flooring is cut around pipes, door frames etc.

Where flooring abuts drainage channels, access covers, quarry tiles etc, use a clamping or welding system.

How do I use AltroMastic 100?

Make sure all surfaces you are sealing are dry and free from dirt, oil or grease. Mask all areas you wish to seal with the masking tape supplied. Place the tube of sealant into the skeleton gun. Cut off the end of the tube nipple, fix the nozzle, squeeze the trigger gently and apply a bead approximately 3mm in diameter. For best results, try and apply with a steady flow. You may wish to smooth out the sealant once you’ve finished, for enhanced aesthetics; if you do, try using a slightly damp cloth so the mastic doesn’t stick.

Once opened the curing process begins, therefore, do not reuse open tubes as the mastic may have cured within the tube.

Remove all masking tape as soon as possible as AltroMastic 100 is formulated to be fast curing.

What equipment do I need to use it?

To use it all you need is a standard mastic gun, available from most flooring wholesalers.

What is AltroMastic 100 made from?

It’s made from neutral curing silicone rubber, one component, vulcanising under the influence of humidity. It is solvent-free.

What is the curing time?

24-48 hours

What is the skin time?

20 minutes

How do I store it?

Store it between 5°C to 25°C in cool, dry conditions.

What is its shelf life?

At least 12 months, in an airtight container, from the date of manufacture.

What is the working temperature?

Between 5°C to 40°C

How long does it take to achieve full bond?

4 days

How much does it contain?


What is the coverage?

40 linear metres at a 3mm bead

Does it contain animal products?


Where can I find out more?

We offer a full technical data sheet to support you as you use this product. For any further queries please call our Customer Care Centre on 01462 489516.

What skill level do I need to use this product?

This product is suitable for use by professional installers or those with extensive experience of working with flooring sealants. If you have any doubts about whether you have the right skill level to use it, please call us in advance to discuss

Health and Safety

Before using this product, please refer to the SDS, (Safety Data Sheet) for correct safety guidance and to determine the appropriate level of PPE (Personal Protective Equipment) and RPE (Respiratory Protective Equipment) that are required. 

Always carry out a COSHH (Control of Substances Hazardous to Health) assessment and risk assessment before using this product.

In the case of contact with eyes or skin, rinse immediately with plenty of water and seek medical advice.


 If you can't find the colour option you are looking for please contact us.