Paul, Thank you for taking the time to spell out your procedure. Newbee's like me need this badly. I too like the OPSL but am not as experienced with spraying of any kind so I'm still making a lot of mistakes. Nice to hear how others are accomplishing great things! Greg Paul wrote: > Del, Terry, List > > I've added water based lacquer to my finishing and along with it new > equipment. I have a 5 hp compressor feeding an Asturo Spray Gun model BBS > fitted with a 1.7mm tip. I sprayed the Oxford Premium Spray Lacquer right > form the can. I did an ebony grand but used tinted clear rather than black > lacquer. To me it has more depth. Since this was my first use of water > based, I had expect some differences and got them. The gun allows you to > control fluid, pattern And air pressure. Line pressure was controlled from > the filters. The lacquer raised the grain a little but no worse than solvent > based. Some air bubbles were evident but cured by adding about 2% retarder. > You can go up to 5% if necessary. This also improved flow out. At first my > air pressure was too low, causing a coarse application, but it flowed out > better than I thought it would. I only sanded between the first and second > coat with 3M's 216u FreCut Gold Sandpaper. One sheet did the entire 7' > grand. Then I applied successive coats, increasing the air pressure until I > got the desired atomization. This step is intuitive. I can't tell you > pressures or feed rates, just practice. I built up about 8 coats about an > hour apart, not sanding between them. There was a fine line between a full > coat and sagging. But I was pleased with the flow out of each coat. I hang > as many pieces as I can to reduce dust contamination. The piano sat for 24 > hours, then cutting down and buffing began. Any sag or ruff spot was easily > leveled with the 216u backed with a wood block. After sanding, the finish > was rubbed with 4F Pumice. I never cut through-save a couple of edges-and > got 100% burn-in between all coats. I inspected the piano 8 days after > delivery and found no change in the finish. > My conclusions: It took me too long the come up with the right delivery. > I'm ordering a finer tip. > I'll be thinning the finish about 10% and use retarder about 2%. > Very low odor and over spray, greatly reduced the volume of exhaust > air. > Sands better than nitro-lacquer; seems to be a harder film. > The gun works well; very easy to clean, especially the fluid filter. > The gun is very versatile; I think it will meet all needs including > spot finishing > I'll never use anything but 3M 216u sandpaper. > Other misc. reasons. > I purchased the gun, lacquer, and sandpaper from Jeff Jewett at Homestead > Finishing, P.O. Box 360275, Cleveland Ohio 44136-0005 > www.homesteadfinishing.com > > Paul Chick -- Greg Newell Greg's Piano Forté 12970 Harlon Ave. Lakewood, Ohio 44107 216-226-3791 mailto:gnewell@ameritech.net
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