A: On the labels and datasheets for Feast Watson wood coatings, we have the following statement:” DRYING AND RECOAT TIME. All timings quoted at 25C and 50% humidity. Cooler or humid conditions may require longer.” What this means is that the recoat and dry times given for the product were when it was tested at these stated conditions (Note: 25C and 50% humidity is a standard laboratory test condition as defined in Australian Standard
AS/NZS 1580.101.5:1999 Paints and related materials - Methods of test - Conditions of test - Temperature and humidity control). This does not mean that in weather conditions different to 25C and 50% humidity, a coating will not work. The coatings will work and will dry; they may simply dry faster or slower than the given times. For example: If the temperature was much higher than 25C, the coating will dry faster. Hence it will be necessary to work faster to keep a wet edge and avoid lap marks. If the temperature was much lower than 25C, the coating will take longer to dry. Hence you will have to wait longer before you can apply the next coat. If the humidity was much higher than 50%, the coating will take longer to dry. Hence you will have to wait longer before you can apply the next coat. There will be conditions in which we recommend you do not apply a coating. These conditions are also outlined on the labels and datasheets. “Do not apply this product in temperatures below 10C or above 35C, or when rain or heavy dew is expected during the drying period. At temperatures of 10C or lower, the coating would take too long to dry, and there may be coating problems (e.g. milky or hazy finish, uneven gloss, prolonged tackiness, etc.) At temperatures of 35C or higher, the coating would dry too fast, and there may be coating problems (e.g. patchy finish, severe lap marks, blistering, etc.).