---------------------------------------------------------- Kolb-List Digest Archive --- Total Messages Posted Thu 07/23/15: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:41 AM - the problem with Poly brush....and the rest.... (Herb) 2. 06:34 AM - Re: the problem with Poly brush....and the rest.... (Charlie England) 3. 06:38 AM - Re: the problem with Poly brush....and the rest.... (b young) 4. 07:42 AM - Re: the problem with Poly brush....and the rest.... (Herb) ________________________________ Message 1 _____________________________________ Time: 05:41:47 AM PST US From: Herb Subject: Kolb-List: the problem with Poly brush....and the rest.... Fellers starting to spray poly brush and find that it creates a surface like sand paper...I use 4 to 1 ratio...1 part 8500 reducer/retarder..but still seems to be going on dry...picking brains...Herb ________________________________ Message 2 _____________________________________ Time: 06:34:42 AM PST US Subject: Re: Kolb-List: the problem with Poly brush....and the rest.... From: Charlie England On 7/23/2015 7:41 AM, Herb wrote: > > > Fellers > > starting to spray poly brush and find that it creates a surface like > sand paper...I use 4 to 1 ratio...1 part 8500 reducer/retarder..but > still seems to be going on dry...picking brains...Herb Never used it, but, from the Polyfiber website: *When I sprayed on the first coat it dried rough like sandpaper. What's wrong? *>Excessive heat or inadequate thinning is causing the Poly-Brush to dry before it reaches the surface. Add about 2 ounces of retarder BR8600 to each quart of reduced Poly-Brush. http://www.polyfiber.com/techquestions/polybrush/#I thought we were supposed to brush on Poly-Brush. Now you are talking about spraying it on. What's the deal? ________________________________ Message 3 _____________________________________ Time: 06:38:10 AM PST US From: "b young" Subject: Re: Kolb-List: the problem with Poly brush....and the rest.... Herb,,, what air temperature are you spraying in? how far away from the fabric are you holding the spray gun? are you using hvlp,,, or a higher pressure gun? if the temperature is to high, if you are holding the gun to far away from the fabric, if the temperature of the compressed air is too high, you may be getting too much evaporation of the poly brush before it hits the fabric... when I sprayed my plane,,, I used a higher pressure gun... only because I all ready had it... I noticed that after a while as the temperature of the compressor and tank would warm,, I would start to get some condensation moisture spraying on the surface. I probably should have added a dryer to the line,,, but I did not have one,,, so I added a 40 gal water heater between my compressor tank and the spray gun... that did several things,,, it collected the condensation and also cooled the air going to the spray gun. it decreased the start stop cycles on the compressor, and also gave a smoother air flow... just for consistency sake,,, I was a plumber and I had the water heater hanging around as well. my compressor was running at 65 psi and I would reduce that as the air went into the air hose. I cant remember but I was probably 20 to 35 psi at the gun.... I suggest trying on some scraps and get it working before you get to your plane. maybe you could adjust the volume of paint you are putting through your gun... a higher volume and moving faster to prevent drips may give a smoother finish,,, you could clean up the sand paper texture with MEK or poly reducer. boyd y -----Original Message----- From: Herb Fellers starting to spray poly brush and find that it creates a surface like sand paper...I use 4 to 1 ratio...1 part 8500 reducer/retarder..but still seems to be going on dry...picking brains...Herb --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ________________________________ Message 4 _____________________________________ Time: 07:42:40 AM PST US From: Herb Subject: Re: Kolb-List: the problem with Poly brush....and the rest.... Boyd,Charlie I bought two gals of the RR8500 from ACF. I am using a high pressure gun...Taiwan knock off of one of the American guns. I did a pretty good job some years ago...but now am in a pickle... I will try another air compressor...to see if its larger tank will keep the air cooler...and will reduce the air pressure at the gun...I usually get my painting advice from a paint and body man...but Poly fiber has him baffled..:-) I moved quite close to the fabric to get the results that I have ..but did not do much spraying so that I do not have too much to clean up... Herb On 07/23/2015 08:35 AM, b young wrote: > > Herb,,, what air temperature are you spraying in? how far away from > the fabric are you holding the spray gun? are you using hvlp,,, or > a higher pressure gun? if the temperature is to high, if you are > holding the gun to far away from the fabric, if the temperature of the > compressed air is too high, you may be getting too much evaporation > of the poly brush before it hits the fabric... > > when I sprayed my plane,,, I used a higher pressure gun... only > because I all ready had it... I noticed that after a while as the > temperature of the compressor and tank would warm,, I would start to > get some condensation moisture spraying on the surface. I probably > should have added a dryer to the line,,, but I did not have one,,, > so I added a 40 gal water heater between my compressor tank and the > spray gun... that did several things,,, it collected the > condensation and also cooled the air going to the spray gun. it > decreased the start stop cycles on the compressor, and also gave a > smoother air flow... just for consistency sake,,, I was a plumber > and I had the water heater hanging around as well. my compressor > was running at 65 psi and I would reduce that as the air went into the > air hose. I cant remember but I was probably 20 to 35 psi at the > gun.... > > I suggest trying on some scraps and get it working before you get to > your plane. maybe you could adjust the volume of paint you are putting > through your gun... a higher volume and moving faster to prevent > drips may give a smoother finish,,, you could clean up the sand > paper texture with MEK or poly reducer. > > boyd y > > -----Original Message----- From: Herb > > > Fellers > > starting to spray poly brush and find that it creates a surface like > sand paper...I use 4 to 1 ratio...1 part 8500 reducer/retarder..but > still seems to be going on dry...picking brains...Herb > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message kolb-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Kolb-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/kolb-list Browse Digests http://www.matronics.com/digest/kolb-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.