Applicator Program

Chemist's Corner: What Hot Weather Means for Exterior Finish Application?

Log Home Exterior Stain Tips and Hot Weather

What does hot weather mean for exterior log home stain application?

August is upon us and with it comes the dreaded heat. Many places in the United States and around the world will see record high temperatures this season. For our applicators, contractors and homeowners, this time of year presents considerable challenges when applying Perma-Chink Products.    

Keep a sharp eye on the weather and look for opportunities where the conditions are favorable for application of our products. All Perma-Chink stains and sealants are waterborne products. If our products are applied when it is too hot - or even worse, on very hot surfaces - the outcome will often not be favorable. Keep in mind that the outside air temperature and surface temperature are two totally different things. For example, depending on the type of surface, it can be up to 50% higher in temperature than the surrounding air. Our application temperature recommendations are based on surface temperature and not air temperature. For best results we recommend a surface temperature between 40 – 90 ֯F for application of our products.

Risks Of Applying In Too Hot of Conditions

If you are in a hurry and decide "I just can’t wait the show must go on regardless!" - we understand. Many of us are under pressure to finish work on a schedule that does not always allow for changes in weather conditions. But it does not mean there are not consequences. For example, if our stain is applied to a surface that is too hot it can flash dry. This quick drying does not allow time for back brushing. The result is often a splotchy or uneven appearance and compromised adhesion to the surface. If you are applying a sealant such as our chinking, it might not adhere well to the top and bottom of each log. There is also the increased chances of blister formation and slumping. Trapped air and volatile water can force its way quickly to a skinned surface and generate an unsightly blister. Avoid application of our products in direct sunlight. The sun will often cause a wall to heat up well beyond the recommended surface temperature range of 40 – 90 ֯F . For a dark-stained wall it is not uncommon for the surface temperature to be in excess of 140 ֯F.

Cool It Down

Consider shading an area to cool it down. Some experienced applicators have recommended starting with the shaded west wall in the morning and in the evening finish with the shaded east wall. Other walls that have been covered and protected can be done last. Furthermore, consider keeping our products in a relatively cool place just before using them. Maintaining our products at a moderate temperature of 60 – 80 ֯F just before application will help to extend open time when staining and applying our sealants. This will give you - as the applicator - more time to get the stain back brushed in properly and achieve just the look you are after. When working with the sealants it will help to improve contact on the top and bottom edge and give the applicator more working time before the product skins over and becomes more difficult to work with. Finally, consider the purchase of a non-contact laser infrared temperature gun. They are readily available from several different manufactures and are relatively inexpensive.

Take Care Of Yourself & Your Crew

When it comes to extreme weather such as heat and sun exposure, your health and safety should come first. While working out in the heat be sure your staying hydrated. Drink plenty of water, especially if you are in a dry, hot and low humidity environment such as much of the Western United States. I have had the opportunity to be out west several times in the past and have done a considerable amount of hiking in the mountains. I remember getting into trouble once with dehydration while hiking out west and it was not pleasant. But you don’t necessarily have to be out west to run into trouble. Dehydration could happen almost anywhere. Be careful, it can sneak up on you before your even realize it. Also, don’t forget to protect your skin as well. Sunscreen, hats, long sleeve shirts, pants all will help reduce the damaging effects of radiation from the sun.



For more helpful tips and recommendations or technical advice please visit our website at or give us a call at 1-800-548-3554.

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