The Toronto Weather Forecast is a Nightmare for Scheduling Deck Staining.
People paint and stain their decks every year but the success rate of making it last is not very good. Without following all the manufacturers recommendations, the stain will fail and it will fail fast. Even if you do the correct prep and apply the stain as per manufacturer’s recommendations, it might still fail. It is not unusual for the stain to fail as early as the following year.
Unfortunately when the stain fails, the only fix is a complete striping, down to the original wood. Stripping can be accomplished with power sanding and a lot of elbow grease but most likely you need to use chemical strippers. After using chemical strippers, you need to rinse the wood very well with bleach or a wood neutralizer. This is a very important procedure because If any of the stripping chemical remains in the wood fibers, another coating failure will definitely happen. Considering all these issues, is it a surprise that residential painters do not like staining decks? We feel exactly the same and only offer this service to a few customers a year. We are more in quality than quantity in these things.
The following are some factors that would make deck staining fail:
- The deck is built too close to the ground and moisture finds its way through the deck.
- The stain is applied too early in the morning when morning dew was present.
- The staining is done too late at night with the temperature dropping below the recommended degrees.
- It is too early in the spring, too late in the fall.
- It is applied under direct sunlight and the surface was too hot to the touch.
- The wood is still too new and internally moist.
- The surfaces are not prepared to open the pores of the new wood (remove mill glaze.
- Surfaces are too wet from a freshly done pressure wash.
- Previous failing paints and stains are not stripped 100%.
- After stripping, surfaces are not neutralized off the stripping chemicals.
- There is a waxy type of sealer from previous waterproofing attempts.
- The wood is not brightened properly and dead wood fibers are still present.
- Poor quality products are used.
Some decks are not even built properly for staining. For example, there is one deck we returned to redo for the past three years. The deck is built too close to the ground and the moisture always penetrates the wood behind the stain. Year after year, the stain blisters and flakes off. Most stains are made to resist the external weather elements, not the internal moisture. This type of internal moisture would eventually damage the wood.
This is a more pronounced issue with the newer low VOC coatings. The high level of VOC in alkyd stains was definitely a valid concern for the environment. Unfortunately, the new water based stains do not do a good job of penetrating the surface. Because of not penetrating the fibres of the wood, they form a film on the surface that eventually separates. For this customer we had to look for an older, traditional, penetrating oil stain.
We did finally source a penetrating oil product that worked for us in the past. It was an oak coloured semi translucent stain made by a well known company. This type of stain was often used with relative success on public parks and docks. We followed all the manufacturer’s recommendations as usual. We stripped the peeling stain first, sanded the surfaces, washed and neutralized the wood and let it dry for a few days. It looked good and we hope that this time the stain will not flake off.
Update: we saw the deck the following summer and the result was again disappointing. The stain did not hold very well. The internal moisture was too much again. We even had a representative from the stain company meet with Ecopainting and the customer. The rep confirmed that the problem was indeed the internal moisture that happens because the deck is built too low to the ground. At least it was easier to remove the failing product this time, because the stain did not form a film on the surface.
Any more attempts to stain this deck would be a waste of effort and money for the customer. There are only two solutions. The first solution is to leave the deck unfinished so that the moisture can move right through the wood. The second solution is more costly and involves re-building the deck, this time considerably higher than the moisture laden ground. The customer was understanding as usual and likely proceeded with one of the two suggestions.
For Deck Staining in the GTA, call us at 416 733-7767 to check our availability. We limit our availability to about 10 -15 decks every year.
This blog was updated last on March 11th 2018