I laid down the second coat of Interlux Perfection on the deck this past weekend. I did it solo as I didn't have available help, but I was fine with that as I really wanted to dial in the application process and get a lot of good practice for the final coat. The day was similar to the first coat, except about 10 degrees cooler and more breezy. Looking back on the day, it seems the humidity was a bit higher as well, and that had some implications. The only other difference was that I started around noon and worked until about 5:30 p.m., as opposed to the first coat where we started at 8 a.m. and went until 1 p.m. This also had some implications. My idea with starting later was to be working when the temperatures were at their highest (only around 75), so I wouldn't have to adjust the thinner ratio of the paint as temperatures rose in the morning.
Instead of only thinning 3-5%, I went straight for the max of 10%. The first coat had way too many sags, runs and drips; implying that I laid down a too thick coat. This time, with a thinner coat, I also rolled on much less paint to be sure the thin coat was able to level out. I also tried tipping with a solvent soaked roller near start of the job, but soon realized that the paint was drying too quickly and tipping was ruining an otherwise good finish.
The application went smooth and I was learning a lot of good technique to get it on there without any sags, drips or runs. This thinned out coat didn't have as good of color coverage as the thicker first coat, so areas that were dark or where I sanded down to the primer weren't covered as well.
When I came back to check out the paint the next day, I found a curious thing happened. All vertical surfaces looked fantastic, if I could get my last coat to look like that I will be ecstatic. However, all horizontal surfaces ended up with a matte/flat finish...no gloss. The finish was very smooth and well laid out, but the gloss wasn't there at all. I found it curious why the vertical surfaces would be glossy but the horizontal ones wouldn't be.
I spoke with Interlux and they believe it was due to the higher humidity in the air, and the time of day that it was applied. It didn't have enough time to dry before dew hit it, and that will ruin the gloss of this paint. So next time I will be sure to do it in the morning again, and just keep up with the thinner.
I took some pictures but when I finally loaded them onto the computer I found that the memory card had been corrupted somehow. By then I had sanded the whole coat down so unfortunately I don't have any photo evidence of the second coat.
I am keeping an eye on the weather for final application this Sunday. The temperatures and lack of rain are spot on, but I am worried about the amount of wind. If all goes well, the wind won't be that bad and I'll have this part of the paint job finished up by the end of this weekend. After that I need to figure out what color I want the non-skid to be, then apply that. That will be a much less stressful endeavor as I can do it sections at a time, and the paint is much less fussy.