There’s a lot of confusion going on about polyurethane applications these days. I have received a bunch of emails that want me to talk about this and, so let’s have a clear conversation about the very basics.
One common question that most ask is how long to let stain dry before polyurethane. Of course, there is a time limit. However, it also depends on the quality of finishing product.
Time Limit to Dry Stain Before Polyurethane: The Best Practice!
Applying a deck stain and sealer with high quality is absolute of no use if you don’t let it adequately dry. The stain will probably get mixed up with the poly. As a result, your poly will take the longest time to settle, sometimes even worse.
The worst scenario is destroying poly’s bonding ability. It literally ruins the overall finish. And so, it’s very important you maintain a particular time limit to let the stain dry.
The Right Timing Rule
No matter what type of project you are working on, one rule goes for all. You need to check the labels of finish or stain.
Many are just barely confused without actually caring about reading the label. There should be some instructions on the time limit you must follow. Add an extra one hour to that amount and let the finish dry.
However, there are some finish products that don’t come up with any instruction. You can go for the standard time limit in that case.
You need to wait for one to two days in most cases. Some finish also needs around 72 hours of the drying process. So, understand what type of finish or stain you are using and let it dry accordingly.
There are certain conditions that might have an impact on the overall drying time. I’ll discuss those in later sections, so keep on reading.
But for the most situation, you can follow this limit I mentioned before applying each coatings of polyurethane.
What Brand Are You Using?
There are different brands that come up with stains these days. They might vary in their formulation. So not all of them will need the same amount of drying time.
Depending on what brand you are using and its particular formulation, drying time can be different.
Some popular brands are okay to let dry for around half to one day. While there are also some options that are super-fast. These let you use a poly just after a minimal six to twelve hours of the drying period.
Your Room Temperature Matters.
Temperature of the room you’ll be keeping stain to dry also matters for drying time. It will have a direct impact on the drying process. Most of the poly is good to apply when temperature is between fifty to ninety degrees.
However, if there’s a certain degree high or lower from this standard temperature, you need to expect a longer drying time.
Most of the stain is okay to dry inside a room with 70 to 75 degrees of temperature. If the room is hotter or colder than that, you will have to count in additional drying time.
Humidity Levels Have Impact
To figure out what humidity effects there are existing, you need to understand the drying process itself.
Basically, the stain drying means it getting evaporated with moisture. The stain starts to dry gradually once the moisture is completely mixed within atmosphere.
Now if you let the stain dry in an atmosphere where rate of moisture evaporation is low, probably drying process will need more time.
In some cases, due to extreme humidity, the drying time gets double than actual. And that’s why humidity has such a frustrating effect on the overall drying process. It can create some significant problems or solutions in the process.
So, when you decide to apply the stain, let it be on a day with less humidity. Or you’ll have to invest extra time between each coating of polyurethane. Sometimes, the humidity creates an irritating cloudy look in your topcoat of polyurethane.
Air Circulation Can Reduce the Time
Now moving on to the final factor that can affect drying period. It’s the air circulation available in room. With more air circulation available, the overall drying process will have better speed.
This is why most professionals prefer to use fans and airing tools for their coating steps. This literally speeds up the entire process and also reduces chance of any error.
You can try using the same method by completing drying process in multiple fan setups. In addition, make sure to open all the windows of that room.
This will increase air circulation further. Also, this way you’ll be avoiding toxic fumes by driving them outside. You see, there’re lot of benefits of keeping your workspace in plenty air circulation.
Looks like it’s almost time for me to wrap up. Before that, I want to tell you something about the exact stain drying time.
You are not going to get an exact answer to this question. Yes, be prepared to find a lot of multi-faced answer. This is because of so many external factors playing major parts in the overall drying time. Starting from temperature to air circulation, everything involved here make an impact on your overall drying time.
However, the easiest method is to follow instruction of your stain products’ label. Or probably you can try using the standard drying period. But for better results with the finish, you’ll have to keep these factors in mind, no matter what.
Hi, this is Mathew from the city of Denver, Colorado. I am a professional woodworker with more than 12 years of experience along with the technical degree regarding the field. I have undertaken many small to large projects and ended with good result. Stay connected to know the knowledge and tips I implemented in my work in process. Thanks.