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Mendrend Application Guides

Important considerations before attempting any repairs.

1. Mendrend Render Repair System is supplied in 2 separate parts: Mendrend Fissure Infill and Mendrend Flexible Penetrating Acrylic. Each part may used individually or together to achieve the desired end result.

2. Please ensure that you request Mendrend colours samples before ordering by contacting us.We do not provide support for Mendrend colour issues if samples have not been tested.

3. With Mendrend Fissure Infill always perform a small test repair to ensure to are happy with correct technique and colour match. If applying Mendrend Penetrating Acrylic apply a small thumb sized patch and allow to dry to ensure correct colour match even if you have previously tested samples. We also advise you to complete a test panel to ensure you are comfortable with the application procedure. Please click here to see why this is important. 

4. Cracks that have only just appeared (Especially on new builds.) should be monitored for a period of at least 6 months to ensure that they are reasonably stable. There is a good chance a newly appeared hairline crack may widen to to something more substantial over this time and if you have new cracks appearing then it is strongly advised to wait until they stabilise and no further cracking is appearing to ensure repair longevity. This is the general recommendation of all anti crack systems in the marketplace.

5. It is recommended to use the Mendrend Fissure Infill in conjunction with Mendrend Flexible Penetrating Acrylic as described below to provide a more robust repair but if you only have a small amount of cracking (For example, if you have just one crack under a window.) which is showing no signs of further movement then you may find just using the Mendrend Fissure Infill on its own will be sufficient.

6. Mendrend Render Repair System is a decorative render repair system only and should not be used to correct structural issues in buildings if they have been identified by a suitable qualified professional.

7. Mendrend Flexible Penetrating Acrylic is designed to correct colour or staining issues evident in problematic render systems. It is not designed to correct texture issues in renders if present. (Flat spots, scrapes, scratches, etc.) These should be corrected prior to the application of Mendrend Flexible Penetrating Acrylic as they may still be noticeable once the coating is applied.

Mendrend Fissure Infill Application.

Mendrend Fissure Infill is supplied in 125CC tubes, to begin application cut the first 8-10mm off the top of the nozzle with a Stanley blade to reveal a hole about 1mm in diameter.

The crack in the render highlighted with the red arrows is the one which we will be repairing.

Press the nozzle of the Mendrend tube against the render so the hole in it is bridging the crack and apply a fine ribbon of Mendrend along the length of the crack to fill it, be careful not to overfill as it is important the texture of the existing render does not get flattened off.

The arrows highlight how the Mendrend infill should look before we commence the final stage in the crack repair process.

Immediately, using a clean cloth and a stiff rubbing motion remove any excess Mendrend from the surface of the render and bring back the original texture. If the render looks flatted due to over-filling repeat this process.

This how the finished result should look. The red arrow highlights where the crack hasn't been filled for comparison.


Mendrend Flexible Penetrating Acrylic Application.

The tips provided here can be applied to all masonary coatings, the aim is to apply a full coat of Mendrend to a standard sized gable of a house without the need for re-application. 

It is very important that you use only the correct roller heads as recommended by us and that the Mendrend is well mixed before application with only a high speed drill fitted with a mixing paddle to ensure the product is activated as this product will settle in transit. We strongly recommend that you apply a small thumb sized test patch and allow to dry to ensure you will be happy with the colour. Please click here to see why this is important.

IMPORTANT: If Mendrend Penetrating Acrylic is not correctly mixed or wrong roller heads are used this may result in an uneven patchy finish once dried.

Preparation is key, ensure the area to be applied is well taped and protected to enable speedy application without any stoppages.

Apply Mendrend Overcoat thinly and evenly over the full elevation without stopping and maintaining a wet edge at all times as failure to do so will result in dry lines. Two storey buildings will require a two man team and having the tools handy that are shown in this picture will make the job much easier. Please note Mendrend will appear lighter when still wet and will dry off darker. It is recommended to avoid applying the material to warm walls in direct sunlight and when rain is imminent.

Do not use brushes for cutting in as they will leave a slightly different texture to the rest of the wall which may be noticeable so use a smaller 4" roller instead as illustrated here.

The finished job, now dried. It took our technicians 30 minutes to apply Mendrend to the entire wall.

Close up the Mendrend should look exactly like the existing render as illustrated, using incorrect roller heads can make the texture look flatter and will use a lot more material which needs to be avoided.