Tested: biobased wood repair resin at lower temperatures


The latest development at Repair Care is the fastest biobased wood repair resin at lower temperatures: BIO FLEX™ COOL. This resin is ideal for the permanent repair of wood rot and damage in the colder weather (<10 ° C). Patrick Nijenhuis, uses the resin. “A fantastic repair resin at lower temperatures. However, the processing requires a little more thought than with the traditional repair care resin. But the end result is very attractive and durable.”


BIO FLEX™ COOL is, according to Repair Care, the fastest biobased wood repair resin at lower temperatures. This product is ideal for the permanent repair of wood rot and damage in colder weather, from 0°C to 20°C (at higher temperatures you can use BIO FLEX™ ALLROUND for example).

The resin behaves like wood: the product can be reworked and painted in the same way and moves with the wood. This resin is easy to mix and can be shaped/modelled very smoothly. The curing time is short: at 10°C, the resin can be sanded and painted over after 16 hours (depending on layer thickness, humidity and temperature fluctuations).

This product contains 35% biobased raw materials and is “OK biobased” certified by TÜV Austria (1 star). It can be used for repairs indoors and outdoors of damaged and rotten wood of window frames, doors, stairs and furniture. This product is also suitable for bonding and filling cracks, joints, knots and (open) connections. In addition, it can be used to renovate, restore and model wood constructions and profiles.


Test results
Beautiful properties are attributed to this repair paste. We asked Patrick about his practical experiences. “Before you start repairing, the moisture of the wood should not exceed 18%, in order to obtain good adhesion and to ensure that wood rot does not develop again. You can measure that perfectly with a moisture meter from Repair Care. At the farm, the moisture of the wood was 14%, so it was sufficiently dry.”

Patrick explains that the BIO FLEX ™ COOL is a two-component paste that you have to mix: “If you dose the two components with a double dosing gun on the EASY•Q™ mixing platform, you can start mixing with EASY•Q™ modeling knives. The color then changes to green. By spreading the paste over the mixing tray with EASY•Q™ modeling knives, you can clearly see whether the color is even. The paste is then ready to be applied. You have to take into account the working time of 20-25 minutes. It does require some experience to properly apply and shape the paste during that time. You should also not keep working in it for too long, because otherwise the paste can start to settle.”

Patrick continues: “After about sixteen hours, at 10°C, the paste can be sanded and painted over. Never try to sand and repaint the paste the same day. Always wait until the next day, then sand. Also pay attention here: make sure that you do not sand for too long and at too high a speed with a sander, because the paste can then start to draw due to the heat development.

Finally, Patrick primed the repaired window frames: “We only paint in the spring, at higher temperatures. In summary, working with this repair paste requires a little more attention, but the end result is perfect. In addition, this product contains 35% biobased raw materials. I think attention to the environment is very important, so you can also work in an environmentally responsible way.”


Text: ing. Frank de Groot
Photos: Patrick Nijenhuis
Reader test, Readers testing products
7 December 2020
Magazine: RenovatieTotaal