Today's Message Index:
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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
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Subject: | 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
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Subject: | Re: the problem with Poly brush....and the rest.... |
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
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Subject: | Re: 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
---
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Message 4
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Subject: | Re: 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
>
>
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