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Subject:	Re: finish not bonding to itself
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Message Thread:

finish not bonding to itself

11/17/24

Caleb Koehn

As part of a small trim business my Dad and I run we do our own trim pre finishing. We've been spraying mohawk versalac, a long pot life post cat laquer ie 6 months. And using their ez vinyl sealer, over finishworks laquer stain.
We've been spraying 1 coat of sealer with 2 of topcoat. Our finish rep just recommended though that we switch that up and do 2 of sealer and 1 of topcoat. This is the first job we've sprayed since. The first round of 19 doors we sprayed unthinned which turned out fine the finish was a little wavy but passable. The next 15 we thinned the sealer 10% to try to get it to flow out better. When we sanded the first coat we notice a little stain color bleed through, then we sprayed the 2nd coat and when we started scuff sanding that one we realized it hadn't bonded to to the 1st coat and you can take a razor scraper and peel it off in sheets. We are trying spray a good wet coat from some test samples we sprayed today in the vicinity of 5-7 mils wet. The shop temp was 60-65 degrees and humidity around 50%. Just wondering anyone has experienced this and what our problem is and what might could be done to prevent it. Ask any questions you need.

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11/17/24 #2: finish not bonding to itself ...

Jim b

Member

Stain not dry,not combat able with top coat

11/17/24 #3: finish not bonding to itself ...

Caleb Koehn

It must be something with the dry time on the stain cause we've shot some test samples that adhered perfectly... our finish rep told us that a tech higher up said he didn't like 3x4 sanders with to fine of grit because you can end up burnishing the sealer???

11/18/24 #4: finish not bonding to itself ...

Stain was not dry enough. 100%.

But go back to your old finish schedule. Almost every staingrade finish failure I have seen in 25 years not related to stain not being dry was on a two seal coat schedule. Use one seal and two topcoats. You�ll get FAR better performance, clarity and with way less liability.

11/18/24 #5: finish not bonding to itself ...

Caleb Koehn

Thanks yall, this is one place on the internet where I've found truly knowledgeable help.. we'll go back to our old finish schedule and definitely give our stain more dry time. I'll post if we have anymore problems hopefully not though...

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