Bostik Pro PU91 Polyurethane Construction Sealant - White

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* +/- 25% flexibility * High modulus * Extremely elastic * Bubble and primer free * Interior and e...

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Product Information

Full details

This guide is for construction professionals and DIY enthusiasts needing a reliable sealant for high-movement joints. Bostik Pro PU91 offers exceptional elasticity, accommodating up to 25% movement, making it ideal for demanding applications. Note that while it's designed for interior and exterior use, proper surface preparation is crucial for optimal adhesion.

All features

Colour	White
Model Part Number	PU91
Brand	Bostik

Extended Product Information

FAQs

What surfaces can I use Bostik Pro PU91 on?

It is suitable for use on concrete, masonry, wood, and many other construction materials. Always check for compatibility before use.

Does it require a primer?

No, it is primer-free for most applications, but for some surfaces, a primer may be necessary. Always check the manufacturer's recommendations.

How much movement can it accommodate?

It can accommodate up to 25% movement.

Can it be used outdoors?

Yes, it is suitable for both interior and exterior use.

How long does it take to cure?

Curing time varies depending on environmental conditions. Refer to the product data sheet for specific curing times.

What is the shelf life of the sealant?

The shelf life is typically 12 months when stored properly. Refer to the product packaging for the expiration date.

How do I clean up the sealant?

Uncured sealant can be cleaned with a solvent such as mineral spirits. Once cured, it may need to be removed mechanically.

What colors are available?

Bostik Pro PU91 is available in white.

Troubleshooting

Sealant isn't adhering properly.

Ensure the surface is clean and dry. Use a compatible primer if necessary for the specific material.

Sealant is bubbling during application.

Apply the sealant at the correct speed, and ensure the cartridge is not too old or has been stored incorrectly.

Sealant is not curing.

Check the expiry date and ensure the sealant is stored properly. Ensure that the temperature and humidity levels are within the recommended range.

Pros and Cons

Pros

Exceptional flexibility for high-movement joints.
Suitable for both interior and exterior applications.
Easy to apply due to the primer-free and bubble-free formulation.
Durable and long-lasting.
Resistant to environmental stresses.

Cons

Requires proper surface preparation for optimal adhesion.
May require specific application tools or techniques for best results.
Limited color options.
Not suitable for all types of materials; check compatibility.

Setup, Compatibility & Care

Surface Preparation: Ensure surfaces are clean, dry, and free from contaminants. Use appropriate cleaning agents.
Application: Apply the sealant using a caulking gun. Cut the nozzle to the desired bead size.
Tooling: Smooth the sealant with a suitable tool (e.g., a wet finger or a smoothing tool) within the recommended working time.
Compatibility: Bostik Pro PU91 is generally compatible with a wide range of construction materials. Always test in an inconspicuous area for compatibility before full application.
Curing: Allow the sealant to cure completely, as per the manufacturer's instructions, before exposing it to movement or the elements.
Storage: Store in a cool, dry place, away from direct sunlight.