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 Sailplane Construction Project Session #155

Comet Sailplane Project
This afternoon I made up an all new mix of satin Klass Kote and shot the bottom of the wing around 1:30 p.m. Later on this afternoon, I decided the wing would be dry enough to spray the top. So around 5:00 p.m. I shot the top of the wing. When I had finished spraying the top, I took the picture below before the atomized Klass Kote epoxy particles had settled out of the air in the closed garage.  
A little later when I went out and checked on how the wing was drying, I took this picture in an attempt to show you the beautifully smooth satin Klass Kote finish on the top of the wing. 
I want to share with you a problem I encountered with the satin Klass Kote. Remember last Friday I sprayed the bottom of the stab. Since I let it dry overnight, I sealed the remaining 6 ounce Klass Kote mix in a jar and put it in the refrigerator. Saturday morning I removed the mix from the refrigerator, gave it a couple of hours to come up to room temperature, and then added just a touch of reducer to help thin the mix. I took the time to thoroughly stir up the mix. Then I mounted the stab on the second support fixture and sprayed the top of the stab.
Here is problem I encountered: As late as yesterday evening the dry coat of satin Klass Kote on top of the stab was not as satin as the rest of the model's components #$@&? (it had kind of a shiny or semi gloss sheen).  The only thing I can come up with as to why is that the mix had been placed in the refrigerator overnight and it had a little additional thinner added, which by the way according to Nate Dickerson was supposed to be OK.
I kept looking at the top of the stab and debating about what to do for a long time. Since I was never going to accept this miss matched sheen of the top of the stab, I remounted the stab on the second support fixture and resprayed the top of the stab this afternoon in between the time I sprayed the bottom of the wing and the top of the wing. As you can see below, by respraying using the fresh satin Klass Kote I had mixed up for the wing, the satin finish of the top of the stab now matches the rest of the model's components. I will call Nate Dickerson (Mr. Klass Kote) tomorrow and see if he knows what the problem could possibly be.
Now I will take my time and spend this coming week going through all of the final installations and assembly on the Comet Sailplane. I will perform a weight and balance to check for meeting the SAM minimum weight requirement and to check for the proper CG location. So I will have a couple more reports to send out before I begin the Sailplane's all important flight test program. But at least I am finally finished with all the covering, painting, and finishing activities!..............................Tandy

Comet Sailplane Project
(I made this Report No. 155a because it is follow up to Report No. 155)
Below is the chemist's findings that Nate Dickerson sent me today. Thank you Nate for taking the time to have this looked into for me  and the other models that are considering using your product.........Tandy
----- Original Message -----
From: Klass Kote
To: Tandy C. Walker
Sent: Wednesday, August 19, 2009 1:29 PM
Subject: Re: Message from Tandy Walker


Hello again Tandy...


Thanks for the write up on the follow up work...


We did check in with the chemist and he stated that the suspended additives that facilitate the "flat satin affect" were chemically altered and re-aligned (i.e. suspended at a different level in the vehicle) by both the addition of reducer, and, by the continuing (ever if ever-so-slight) curing of the mixture while kept at the lower temperatures in the fridge…


We really have not done very extensive research as to the sheen affect of the "kept" mixture - but rather more on the attributes of the mixture once it is re-established at room temperature and applied and cured.  We do know that the attributes that make epoxy such a strong, protective coating are still in tact.


This truly has been a teaching point for us and we plan to conduct some additional research and try to determine if there are any additional work-arounds.  In the mean time, we recommend to users who are sensitive to the gloss levels of the dried film, - to please, not suspend the mixture at lower temperatures, but rather re-mix additional batches as needed...


Tandy, I wanted to take a moment to thank you again for your excellent reporting on this project.  It is users like you that allow us to continually improve our product offerings to the industry.


P.S. - one Note... We are in Minnesota - not New Jersey!!!



Nate Dickerson
Diversified Solutions, LLC.
Klass Kote Quality Coatings Division
5932 Chicago Ave S. Minneapolis, MN 55417
Web: - Email:
Ph: 612-243-1234 - Fax: 612-216-2121

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