Hi Terry - Yes, I use Oxford PSL and really like it. As a rule, making coats "as thick as you can make them" is not a good overall policy, in my experience, either with water-based OR solvent-based material. You are just begging for orange peel and 'soft belly', and other unmentionables. Yes, I am still using the Accuspray conversion gun. I am not really familiar with your gun, although I have heard of it and am sure it is fine. Try a nozzle/cap configuration that gives you better atomization, or thin the material 5% with water and spray thinner coats, or ideally both. There is a flow-out additive/retarder that Target Coatings makes that is compatible with the PSL, something like SA5, that you may want to try if you continue to have problems. I have not found the need to use it, but it may be appropriate in your situation. You may be spraying too far from the surface, too. Also, the temperature and humidity play a role here, as well. Sounds a bit like voodoo magic, eh? Make sure Saturn is aligned with Uranus and there is a total eclipse of one of Jupiter's moons! (kidding, of course...) Basically, if your temp is in the 70's, humidity 45-65%, and you spray thinner coats of thinned material from about 6-8 inches from the surface, you should have very good results. Mark Potter bases-loaded@juno.com On Sun, 31 Dec 2000 13:52:34 -0500 "Farrell" <mfarrel2@tampabay.rr.com> writes: > Hi Mark. I am spraying Oxford PSL for the first time. Lots of orange > peel. I > wish I had read your post below from last January and tried to spray > it a > bit thinner - I know my coats were going on just about as thick as I > could > make them without running. Do you still suggest trying thinner coats > to > minimize orange peel? > > Are you still using your conversion AccuSpray gun? I am trying a Eco > gravity > gun. > > Terry Farrell > Piano Tuning & Service > Tampa, Florida > mfarrel2@tampabay.rr.com > > ----- Original Message ----- > From: <bases-loaded@juno.com> > To: <pianotech@ptg.org> > Sent: Saturday, January 29, 2000 11:39 PM > Subject: Re: Refinishing Problem > > > > HI Terry - > > > > I have been using Enduro for some time now, and use an Accuspray > gun, as > > well. However, I use a compressor to power my gun instead of a > turbine, > > so I use the so called "conversion" gun (Accuspray Model 10). > > > > At any rate, I have sprayed their Poly quite often, and have used > the > > .043 nozzle with the # 9 cap, as you indicated. I switched over > to a # > > 7 cap about a year ago, for better atomization. The differences > are not > > dramatic, but they are tangible. > > > > I would recommend solving your problem this way: definitely spray > > thinner coats. It's visually more deceiving with the water-based > than it > > was with the old nitro. A proper coat tends to "look" like it > needs more > > material, but it doesn't. If you are applying coats that look > really > > wet, then they are too heavy. The only times I have had trouble > with > > water-based stuff is when I got too heavy. Also, you might try > adding > > about 5% water to the finish. This will help flow-out a bit. > They very > > well may have a flo-out additive, or a retarder of some type, but > I have > > never needed it, so I'm not sure. > > > > I'm assuming, of course, that there is no problems with > contaminants on > > the wood, and that there is an adequate mechanical bond available > for the > > poly. What are you spraying it onto? A sealer? Shellac? > Itself? Poly > > can be finicky in what it adheres to, and how well. In all > likelihood, > > thinner coats will solve your problem. > > > > If you continue to have problems, you might try contacting Enduro, > or go > > straight to Mark Ellis, their seminar guy. He is quite > knowledgeable > > about their products, and is very helpful. You probably have > Enduro's #. > > Call them to see if they can help; if you don't feel they are > solving > > your problem, ask them for Mark's #..... I'm sure he can coach > you thru > > it. > > > > BTW, the last job I did I used a finish by Target Coatings called > "Oxford > > Hybrid Varnish". It's a water-based urethane that somehow > includes a > > modified tung oil, and had the warmest look of any WB finish I > have seen > > to date. I sprayed it, but I am told that it brushes on like a > dream. > > If you are at all interested, check out www.targetcoatings.com > > > > Mark Potter > > bases-loaded@juno.com > > > > On Sat, 29 Jan 2000 18:20:23 -0500 "Farrell" > <mfarrel2@tampabay.rr.com> > > writes: > > > PianoTech Refinishers: > > > > > > I am looking for input from any of the refinishers in the group > that > > > work > > > with water-base materials. I am having trouble with what I > believe > > > is > > > commonly referred to as "orange peel". > > > > > > I am using Enduro polyurethane water-base hi-gloss clear-coat > > > (numerous > > > refinishers have indicated that it is the "best") with an > Accuspray > > > spray > > > gun equipped with a #9 nozzle and a 0.043 tip (this is the > > > combination > > > recommended by Enduro for the product I am using). My sprayer is > > > supplied > > > with air by a 3-stage turbine. I am typically spraying with > > > atmospheric > > > conditions of about 80 degrees and 60% relative humidity. > > > > > > My understanding is that "orange peel" (my refinishing is coming > out > > > looking > > > like the skin of a basketball - only finer grained - is this > "orange > > > peel") > > > is caused by the material drying before it has sufficient time > to > > > flow out. > > > It seems to me that 80 degrees is not too hot ( it is hard to > get it > > > lower > > > in the summer), and 60% humidity is certainly not too dry. I am > > > spraying > > > within 6 - 8 inches from the object being sprayed. I am putting > on > > > what I > > > think is enough material - it looks real wet and if I put any > more > > > on it > > > will run (I know that for a fact!). > > > > > > What on earth am I doing wrong????? Anyone???? Any ideas????? > > > Help!!!!!! > > > > > > Terry Farrell > > > Piano Tuning & Service > > > Tampa, Florida > > > mfarrel2@tampabay.rr.com > > > > > >
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