freedhardwoods Posted June 9, 2020 Report Share Posted June 9, 2020 This is our first set of cabinets painted white using our MiniMite 5 spraying lacquer. We spray one undercoat/sanding sealer, sand, then two finish coats. On a few of the cabinets, small pinholes in the paint will show up on the last coat when there wasn't any sign of a problem on the first two coats. It isn't bubbles. Anyone know what is causing this? Also, I don't think the gun is atomizing like it should. We have tried different tip sizes, fluid pressure, air volume, thinning ratios, etc. Any suggestions on that? Quote Link to comment Share on other sites More sharing options...
wtnhighlander Posted June 9, 2020 Report Share Posted June 9, 2020 Any chance you can post a clear photo? Quote Link to comment Share on other sites More sharing options...
Coop Posted June 9, 2020 Report Share Posted June 9, 2020 I hate a sprayer for that exact reason and I’m sure the liability is on me and not the sprayer. Quote Link to comment Share on other sites More sharing options...
freedhardwoods Posted June 9, 2020 Author Report Share Posted June 9, 2020 7 hours ago, wtnhighlander said: Any chance you can post a clear photo? I was so busy at the time, I forgot to get one. Quote Link to comment Share on other sites More sharing options...
freedhardwoods Posted June 9, 2020 Author Report Share Posted June 9, 2020 6 hours ago, Coop said: I hate a sprayer for that exact reason and I’m sure the liability is on me and not the sprayer. I think we didn't prepare the wood right, but that's just it, I'm guessing. Quote Link to comment Share on other sites More sharing options...
drzaius Posted June 9, 2020 Report Share Posted June 9, 2020 Any possibility of silicone contamination? Maybe someone used some aerosol silicone lube or furniture polish in the same room as your cabinets? It only takes microscopic amounts. Again, pics would help. Quote Link to comment Share on other sites More sharing options...
freedhardwoods Posted June 9, 2020 Author Report Share Posted June 9, 2020 5 minutes ago, drzaius said: Any possibility of silicone contamination? Maybe someone used some aerosol silicone lube or furniture polish in the same room as your cabinets? It only takes microscopic amounts. Again, pics would help. I pretty sure we haven't had any spray like that in the shop. I really wish I had taken pics Quote Link to comment Share on other sites More sharing options...
Mark J Posted June 9, 2020 Report Share Posted June 9, 2020 Freed', I assume you've corrected the finish on this project, but you don't want to repeat the problem on the next. You might have to try to reproduce the problem on some scrap. Quote Link to comment Share on other sites More sharing options...
freedhardwoods Posted June 9, 2020 Author Report Share Posted June 9, 2020 I got a pic today. This is a face frame. We went over this with a magnifying glass after the first finish coat. Smooth as glass. Put on the second finish coat and there it is. it's like some hole in the wood decides to open up when we think we're done. Could the final sanding grit have something to do with it? We have been finish sanding to 150 for paint. Quote Link to comment Share on other sites More sharing options...
drzaius Posted June 9, 2020 Report Share Posted June 9, 2020 If the previous coat was glass smooth, then I would think it would have nothing to do with the previous coats. Fish eyes from silicone do not look entirely unlike those divots. 2 Quote Link to comment Share on other sites More sharing options...
Tom King Posted June 9, 2020 Report Share Posted June 9, 2020 Those look different than the typical pinholes. Are you sure they're only in the finish? 1 Quote Link to comment Share on other sites More sharing options...
freedhardwoods Posted June 9, 2020 Author Report Share Posted June 9, 2020 1 hour ago, Tom King said: Those look different than the typical pinholes. Are you sure they're only in the finish? I really think it's in the wood, but don't understand why it waits to show up. Quote Link to comment Share on other sites More sharing options...
wtnhighlander Posted June 10, 2020 Report Share Posted June 10, 2020 Looks like a drop of sweat dripped into the finish as it went on. I've seen a lot of that! Quote Link to comment Share on other sites More sharing options...
freedhardwoods Posted June 10, 2020 Author Report Share Posted June 10, 2020 18 hours ago, drzaius said: If the previous coat was glass smooth, then I would think it would have nothing to do with the previous coats. Fish eyes from silicone do not look entirely unlike those divots. I won't rule out anything, but I don't know where silicone would be coming from. Quote Link to comment Share on other sites More sharing options...
Larry Moore Posted June 11, 2020 Report Share Posted June 11, 2020 My 71 year old brain doesn't work like it used to, but maybe it will give someone else a start. There is a difference in sandpaper substrates one of them is not recommended for finishing because it contains silicone and that is what this looks like. 1 Quote Link to comment Share on other sites More sharing options...
drzaius Posted June 11, 2020 Report Share Posted June 11, 2020 2 hours ago, Larry Moore said: My 71 year old brain doesn't work like it used to, but maybe it will give someone else a start. There is a difference in sandpaper substrates one of them is not recommended for finishing because it contains silicone and that is what this looks like. I wasn't aware of that. It would be good to know what kinds, so to avoid them. Stearated paper doesn't. Quote Link to comment Share on other sites More sharing options...
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