Sometimes, ChatGPT generates code snippets that include libraries or SDKs that were explicitly requested not to include. For example, I might ask it to provide me with a snippet of code using only standard C++ libraries, but instead it would include a SDK like Qt no matter how many times I asked it not to. This can be super frustrating and often makes me crazy. I have had many sessions where I resorted to calling ChatGPT some of the worst names I could think of, only to feel terrible afterwards.

I remember a job from my contracting days where we were restoring some floors in a historic home in Denver. The homeowner was a cabinetmaker, and he was meticulous. We resanded the home's original fir floors, and when it came time to coat them, I was using a waterborne finish that had just hit the market (in fact, all waterborne finishes were pretty new back then). The kitchen had floor-to-ceiling windows and a lot of can lights, and it seemed to be impossible for me to get a coat of finish on the floor that looked good. I kept trying different techniques, and I just couldn't get it to be acceptable, at least not up to this client's standards-what nine out of 10 customers would consider to be acceptable wasn't good enough for him. I accepted his challenge of perfection and continued to embrace what seemed to be an unattainable feat. Finally I had to call my local finish rep to come out to the job, and with his help we were able to lay down a beautiful coat of finish and get paid.


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I learned a lot of lessons about finish from that one job, from customer expectations to how lighting affects finish and also when and where to try out a new finish. But I am not alone: You won't find a wood flooring contractor out there who doesn't have plenty of finish horror stories to tell. In this article I'll try to share some of the most common finish problems I see and talk about things I've learned to prevent them. But before that, let's talk about those customer expectations.

You need to be confident in understanding what the realistic expectations are for a site-finish wood floor and translate that confidence to your customer. Have you ever had a customer tell you there's a problem and you need to come see it at a certain time of day when the sun hits it from a certain angle with your head cocked to one side just right? Per our industry standards, this perceived "problem" that needs to be viewed under specific conditions may not necessarily be a problem at all. It's unrealistic to think a site-finished floor will end up looking like furniture or cabinets. It's also unrealistic to think the finish on furniture or cabinets will perform the same as wood floor finishes. We don't walk on furniture and we don't (usually) eat on our wood floors. These finishes are manufactured to perform for different purposes and are applied using different methods; therefore the final results for wood floor coatings are completely different from cabinets or furniture. When assessing wood floor finish issues, the standard is to evaluate the floor under these conditions:

Before you start the job, paint a picture for the customers of what to expect during the project and, more importantly, when the job is done. This opening conversation with your customer is extremely important and will ultimately affect how your entire job will flow. They need to know ahead of time that wood floor finish is designed to be walked on and that it will not look or perform like their kitchen table. Once your customer understands the complexity of applying finish in an uncontrolled environment and the potential unexpected pitfalls we can endure at the time of application or during dry times, they will better accept minor inconsistencies in the finished product. With that said, let's talk about some problems:

Sometimes the appearance of different sheens can just be an optical illusion. Lighting and variations in subfloors can make light reflect differently off the surface of the floor. Of course, good luck trying to convince your customers that they're seeing things!

Mix the Finish Well: Whether it's a new floor or a repair, mixing the finish properly is key. Matting agents tend to settle at the bottom of the container, so if the finish isn't mixed well, the finish will usually start out shinier and end up duller.

Expect Sheen Differences: If you're coating a big area, mix all the gallons you need into one larger container; this is called "batching your finish." The sheen can vary slightly from one gallon to another or from batch to batch, so mixing the finish together avoids problems with these minute sheen inconsistencies on your floor. Also, never assume that just because two different finishes are labeled the same, like "matte" or "satin," they will have the same sheen. Sheen levels are inherent to specific finishes and can vary from one manufacturer's product to another. For example, one satin product may have a gloss level that's 15-20 and another product may be 25-30. Sheen levels are proprietary to the products.

Match Sanding Sequences: The scratch pattern on the flooring surface affects how light reflects off the finished surface. If you have a floor that you final screened with a 220-grit and you hand sand the perimeter of the floor with 120-grit, the gloss level of the final coat will ultimately be different around the perimeter than in the field based on how the ambient lighting is reflecting from the surface.

Keep Consistent Mil Thickness: Say you've got a 1,000-foot floor and two gallons of finish. You're on your last stretch and realize you're running out of finish and may not have enough to finish the job, so you start putting more pressure on your applicator and begin squeegeeing out finish to ensure you get a coat on the whole floor. You will most likely get a callback due to sheen variation. The thickness of the finish affects the appearance of the sheen: The thicker the coat, the higher the gloss level.

Use a New Applicator: Many contractors like to reuse their applicators by washing them out and storing them in containers full of water. Regardless of how clean you think you're getting it, it's almost impossible to get all the finish out of an applicator. Applicators are specially designed to hold onto finish; any remaining finish in the applicator will be transferred to the subsequent coats and can interfere with your final coat. Many of us have always cleaned out our applicators after every job and reused them on the next job without problems. The problem is the one job that goes south and becomes the job we don't get paid on-that can set us back weeks, if not months, in revenue. Keeping a fresh applicator for every job takes one more variable out of the equation for potential failure. If you're adamant about reusing your applicators to save a few pennies, I recommend using a designated applicator for build coats and always using a new applicator for the topcoat (just be sure to de-shed it first). Build the miniscule cost of a new applicator into every job.

Give it Time to Cure: Finish sheens can change slightly (or "mellow") as a product cures out. If you're trying to match an existing finish, make sure you let your finish totally cure before you determine if it's a match or not. I'll never forget the lady who called three hours after I finished her job complaining that there were shiny spots on her floor. When I went to her house two days later, everything was perfect.

Feather Finish In: When doing repairs, take your time to assess the repair area and determine whether you will be able to feather in your repair or need to cut it off at good breaking points (doorways, cabinets, etc.). I like to use the analogy of an airplane taking off and landing when discussing feathering finish. Many times you can blend areas by simply feathering the finish into the field. This method of repair is acceptable when a) you know the finish you're matching and b) your customer understands the importance of evaluating the repairs after the repair area has fully cured out.

Thin Down the Finish: Depending on your finish, you may be able to thin it down and apply multiple thinned coats. This gives you more control over the build and final appearance. Some waterborne finishes can be thinned down by adding water, and some oil-modified poly can be thinned by adding mineral spirits. You have to check with the manufacturer to determine if that will work for the product you are using. This method is extremely helpful when I have an isolation repair and need to build up the finish at the repair area for a perfect match. I like to apply multiple thinned coats to the area of contention, then carefully blend out subsequent coats beyond the area for the final blending. When I do this, I use a hair dryer or a heat gun to speed-dry each coat and determine how my sheen levels and build compare.

Recoat Everything: When in doubt on repairs, I would simply recoat the entire area or room or find good breaking points. One good approach is to look for areas in the room where the light sources affect the appearance of the floor. Perhaps there's a row of windows or different lighting sources that already create a difference in the perception of the finish; those are great areas where you can determine whether to feather repairs or to find a breaking point.

Lay it Down and Leave it Alone: When I teach someone to coat a floor I tell them to focus on a manageable work area-about 3 by 3 feet-where you can comfortably keep focus on small areas without overextending yourself. Focus on that one small area and ignore the rest of the floor. If you see a small puddle or a spot you missed 6 feet out, don't touch it. Once the finish is dry you can do minor repairs, and that's easier than repairing a big area of overworked finish. Depending on the finish and the humidity on the job site, you may have a very short window of opportunity to touch that finish again once it's down. This is also a common issue when you haven't mapped out your coating strategy prior to application. 006ab0faaa

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