My Guidelines for Painting Wooden Toys with Acrylic Paint

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When it comes to toy making, the effectiveness of your painting process can greatly depend on the weather conditions. Many toy makers often seek clarity on how factors such as humidity, temperature, and sunlight can influence the application and durability of acrylic paints. Unfortunately, there isn’t a wealth of accessible, straightforward information on this topic. Many resources tend to provide vague advice like “don’t paint in the rain” or “avoid direct sunlight,” leaving toy makers with more questions than answers. Understanding the specific conditions under which acrylics perform best is essential for ensuring a successful and polished finish. This guide aims to provide valuable insights and practical tips based on advice from professionals in the industry, helping toy makers achieve the best results for their projects.

I did a lot of searching, trying to locate some definitive answers to painting with acrylics and weather conditions. I didn't find much. Most were along the lines of "don't paint in the rain" and "don't paint in the sunlight." I found some good info, mostly gleaned from forums where professional house painters hang out and from company websites.

 Don't Paint when the dew point is within 5 degrees of air temperature.  The paint will not cure properly, and the chance of running and sagging will be very high.  Cure times will be lengthened.

 I don't know how you are going to get the dew point without some instrument. I have a personal weather station from which I can get it.

 Another way to look at this is to not paint when the humidity is high. It's an oversimplification, but it beats nothing. I have a previous post here somewhere about some paint that would not cure right. Humidity is probably what caused the problem. The paint finally did cure after it sat in the garage for a few weeks.

 Don't paint in direct sunlight; it should be obvious if you know anything about sunlight and surface temperatures. At midday on a sunny summer day, I have seen the surface of the soil in my garden in excess of 140 degrees. Some surfaces have even higher temperatures. You can check this with one of those laser thermometers. The paint will cure too fast and will not flow out properly. Bonding and durability will also be affected. No shiny, smooth paint jobs for you.

 Don't paint if the temperature is below 50 degrees F a durability and curing time issue. Paint that is applied at low temperatures does not bond as well. The colder it gets, the worse the problem is, and curing times are greatly increased.

 Don't paint at temperatures higher than 90 degrees is pretty much the same thing as painting in direct sunlight but less severe. This is one of those unless you have to things. Some of us in the deep south are just going to have to do it, and I hope it works out OK.

 Of course, this applies directly to acrylic paint, particularly house paint, but it is probably applicable as a rule of thumb for most paints.

 There are also low humidity limits. However, since I live in Florida, I'm never going to have that problem. I have some experience with spraying lacquer in dry environments. I've seen days when the paint would dry so fast that all that hit the surface was sticky paint dust. It felt like sandpaper. It's not what you want on your custom hot rod or restored antique.

Understanding the impact of weather conditions on painting with acrylics is crucial for achieving optimal results. By considering factors such as dew point, humidity, temperature, and direct sunlight, painters can avoid common pitfalls that lead to poor adhesion and finish quality. While there are many nuances to navigate, adhering to these guidelines will help ensure a successful paint job. Whether you're a seasoned professional or a DIY enthusiast, taking the time to assess the environment before starting will save you from future frustrations and enhance the durability and appearance of your work.