Question
We have had two jobs lately with which we had a problem with MLC's CV200 (a low-stink version of Krystal). In both cases, we stained the product with MLC stains and allowed for the proper cure time (actually about 4 times the recommended cure time). The first coat went on fine. Scuff sanded smooth. Second coat, we got this peeling (like your back after being out in the boat all day when you forgot the sunscreen). The peeling starts at the corners/edges of panels or shelf nosings, but only in one or two places (usually a 2-3 inch long area). The rest of the nosing and entire cabinet or shelf is fine.
It really looks like the second coat of CV200 is dissolving and lifting the first coat. But only near the edges, as if it's getting up under it where I may have sanded completely through the first coat. But why am I having this problem only on this product? Never happened before with Duravar, Krystal, or Magnamax. Not even a hint of this.
We contacted the rep and we have yet to get an answer we believe. They claimed that the catalyst sometimes settles out of solution, leaving a less-durable coat. This can't be the case, because the first coat we lay down is a freshly mixed batch. Anyone else have problems with CV200? It is a fantastic product when it's behaving, which is the vast majority of the time. We just can't have this peeling thing happen on every other job; it's a pain to fix (you have to sand to raw wood and restain/recoat).
Forum Responses
(Finishing Forum)
From contributor J:
I can't answer your post since I have not used that particular product. But I have started using Target's CV and find it very easy to work with and a very nice finish. I have not had any problems with it.
"Settle out of solution"? Maybe I missed something, but settling is something that happens with suspensions. Solutions stay dissolved until stuff evaporates, then you have precipitates. When adding catalyst, the mixture has to be thoroughly stirred.
Instead of asking your rep, you want to get the MLC technical support involved. You need the input from the formulator(s), not a salesman. ML Campbell makes great products. But has there ever been an instance where in a crunch, they have had to stand behind their products? According to them, it's always, always operator error (and this is usually the case regardless of the manufacturer, but there does exist in this world bad batches and bad formulations).