All label directions are designed to create the absolute best application situation that will allow for the widest range for variable conditions (known or unknown). Sometimes, reality will not allow for ideal conditions and you need to adjust to do the best you can within the existing conditions. How much you can vary from the ideal is your judgment and common sense, but certainly test as best possible and look for surprises.
As a general guideline of what to expect regarding temperature:
- For petroleum based products - the colder it is, the longer it takes to dry and cure. This should not effect ultimate performance unless, perhaps, conditions are too extreme. For water based products, surfaces close to freezing might not work at all.
- For petroleum or water based products - the hotter it is, the faster it dries and cures. If too hot, it could be so fast as to effect its ability to penetrate and/or bond. It is better to do it early in the morning when the surface has had a chance to cool down all night.
Uneven texture (highs and lows on stone, depressed grout joints, etc.) - pouring makes puddles.
This is one of those
situations where you just have to figure out what will accomplish the label goals the best for you. Any tool or techniques that will let you create an even finish is ok. In some cases the liquid runs down the high points and creates a pooling in low spots no matter what you do. Try a test patch and let if fully cure for a day or more. Some sealers can take longer for pools to dry out, but should end up fine. A lightly applied second coat might be all you need to create an even finish.
You can use brush or roller to move liquid out of a low spot so long as the liquid has not set up enough to create drag lines or streaks. Otherwise, just wait for the test area to dry as above.
For doing wall and ceiling applications it is obvious you cannot follow the label directions that are meant for flooring. Just use an application technique that works best for you and do as best possible to achieve the same goals described on the label.