Wood filler is often used to repair wood that is not in the best shape. Which would include wood in harsh elements, like rain or snow that they can often face from being outside. Even sun light can damage wood, so using wood filler to fix it will be common. So here is what you need to know on how to use wood fillers on outdoor projects.
One: Protect The Wood
After you use a wood filler, you should use a waterproof varnish or sealer. If you do not, you will likely have to use a sealer more often than not. Therefore, you should make it high up on your to-do list after you use the wood filler. This will protect both the wood and filler.
Two: Pick One Type
You will see that wood fillers come in around 3-5 types out in the market. Some are gel-based, clay or liquid. You may also find a few that are other types on the market, like wood dust or something similar. Those would work well with wooden objects that will stay outside, but clay base ones are also a good option for these types of projects. Do not use more than one type and pick one that has a proven record of working well outdoors.
Three: Start Small
You should start out with using the wood filler on a smaller area and then expand it. That way as it dries; you can see how it will react with the wood and how it will repair the damage. Some will not do the job well, while others will do above average. Also, try not to place it on too thickly or it could look uneven or not balanced.
Again, this will all really depend on what type and formula that you pick to use. As it goes along and you keep watching over it, you may need to touch up on it. Sometimes they will require a full second or third coat, or just little touch ups here and there.
Four: Examine While It Dries
While it dries, you may wish to take a look at it and see if you will need to make any adjustments. For an example, to move them around so they do not stick to the ground. You will want it to dry on the wood and not attach itself upon the ground or paper that you have laid it on.
Five: Sand Down & Water Proof It
After everything has settled and dried, you will likely want to protect it from any more element damage. Therefore, you should sand it down with sand paper and then paint on a waterproof wood varnish. Most wood fillers will be able to have a varnish painted over them, but always check the box or bottle ahead of time to see what they say.
These are basically everything you will need to know regarding wood fillers for outdoor projects, but as it was stressed earlier on that you will want to follow the products manufactures instructions most of all. Other than that, this should cover all of the basics.