DAYSON JOINT FLEX 7 is a single component polyurethane based elastomeric sealant which cures under the effect of atmospheric humidity to form a flexible and resistant joint with very good adhesion on most materials.
DAYSON JOINT FLEX 7 can be used for heavy and light precast panel expansion joints, wood, aluminium and PVC joinery seams, and expansion joints in traditional construction. DAYSON JOINT FLEX 7 is highly recommended for bonding baked clay and concrete roof tiles.See also material safety data sheet.
Substrate preparation:

The substrates must be clean, even, dry, free of dust, oil, grease and any contaminants that could harm bonding. If the substrates need to be cleaned, use DAYSONNET 683, methylethylketone (MEK), acetone or grease remover DAYSON 1001. Apply a primer if necessary. Check the compatibility of the solvent used with the substrates. When using solvents, extinguish all sources of ignition and carefully follow the safety and handling instructions given by the manufacturer or supplier. If necessary, rub down metal surfaces beforehand. After rubbing down, the surface should be recleaned. Allow the substrate to dry after degreasing. We recommend to clean concrete with a metal brush.


DAYSON can be applied by a manual or pneumatic gun. After application, use a putty knife to smooth the joint with soapy water. This product should be used within 24 hours of opening the cartridge or sausage; otherwise, the sealant could harden inside. Do not apply at a temperature under 5 °C. In cold weather, store the packagings at about 20 °C before use. Avoid any contact with non-cured MS, hybrid PU or silicone sealants as well as with alcohols or ammonia during curing.


Tools should be cleaned with DAYSONNET 683, MEK or acetone before the sealant has completely cured. After curing, abrasion is necessary.

12 months in the original, hermetically sealed cartridges or sausages between 5 and 25 °C
310 ml cartridges and 600 ml sausages

Not classified as hazardous. Read the material safety data sheet before use.

The technical data contained herein is based on our present knowledge and experience and we cannot be held liable for any errors, inaccuracies, omissions or editorial failings that result from technological changes or research between the date of issue of this document and the date the product is acquired.

Before using the product, the user should carry out any necessary tests in order to ensure that the product is suitable for the intended application.

Moreover, all users should contact the seller or the manufacturer of the product for additional technical information concerning its use if they think that the information in their possession needs to be clarified in any way, whether for normal use or a specific application of our product.

Our guarantee applies within the context of the statutory regulations and provisions in force, current professional standards and in accordance with the stipulations set out in our general sales conditions.The information detailed in the present technical data sheet is given by way of indication and is not exhaustive. The same applies to any information provided verbally by telephone to any prospective or existing customer.