As the temperature continues to plummet to freezing conditions this winter season – this can cause havoc when it comes to flooring applications. Below we go through some of the most common problems that can occur in cold weather below 15°C and offer a trouble shooting guide to remedy these problems.
Did you know the viscosity of a coating increases as the temperature decreases! This can cause:
Curing / Drying is slower in cold weather and can cause “balling” when sanding or foot imprints can be seen the following day.
Solvent evaporation is also slower which can cause “Pimples” or nibs from dust due to wet surface being ‘open’ for a longer time
So, what can you do to remedy these problems? Take a look at our Trouble Shooting Guide for Cold Weather to find out some more reasons, causes and remedies.
|Poor Flow||Cold floor &/or cold temperature &/or cold material
Viscosity in can has increased with time
|Viscosity higher with lower temperature
Past shelf life of hot storage – never use products that have expired past their use by date!
|Add up to 30ml per litre (3%) Wet Edge Extender 3320
Try Wet Edge Extender but may not work if material has reacted too much in the can
|Orange Peel||Cold floor, air or material
Film to thick
|Viscosity high||Add Wet Edge Extender 3320
Minimise film thickness
|Low Gloss||Low temperatures/’Dew Point’ reached
Possible if Dew is on grass outside
|‘Dew Point’ if reached can deposit microscopic moisture particles on surface causing dulling effect||Apply finish in warmer part of the day|
|Slow Drying||Cold (an maybe dry) conditions||Aliphatic (low yellowing) have slow cure in cold conditions||Add DURAPOL 5995 Accelerator (speed up the dry time of DURAPOL coatings)
So, what about oil modified products? Can you use oil modified products in winter?
The short answer is yes. It is recommended that NATURAOIL 1499 Accelerator is added to speed up the drying time – Add to NATUROIL 3100, 3115 & 3120 to reduce drying times. Cold and damp environments will have an effect on drying time. In cold temperatures the coating may have to be left longer to dry between coats. Failure to do so may cause issues with the next coating I.e. frying.
For more information about applying polyurethanes in cold coatings contact your technical service department or local Polycure account executive for further advice.