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                        spraying clear coat

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                        4 replies
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                        Anonymous
                        • Member since
                          November 2005
                        spraying clear coat
                        Posted by Anonymous on Monday, December 19, 2005 8:14 AM
                        very basic question:  i'm spraying polyscale gloss coat with my aztec, unthinned from the bottle, ~15 psi, red (medium?) nozzle.  doesn't run or spatter but the finish comes out finely grainy and sort of rough.  i'm sure a lot of people here would know the answer to this problem off the top of their heads.  does the gloss coat need to be thinned?  can i fix it without changing the mix of the coat so i can dump the access back in the bottle or just hook the bottle directly to the brush?  less pressure?  larger nozzle?  ironically, i think i sprayed the polyscale flat coat the same way and it came out even without the graininess.
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                        jhande
                        • Member since
                          November 2005
                        • From: White Mountains, NH
                        Posted by jhande on Monday, December 19, 2005 10:24 AM
                        I can only be of some help, relating the effect (graininess) from other types of spraying (automotive) since I'm new to AB'ing.

                        Usually a grainy or sandpaper finish is caused from the atomized paint drying "before" it gets on the object.

                        You can try getting closer to the object or more paint flow than air flow.
                         
                        Do a drip test, compare how the polyscale gloss drips compared to a paint that you have good results with. If they both drip fairly equal, I would try changing my painting technique (above) before changing the viscosity of the paint.

                        My 2 cents [2c]

                        Hope someone has a more definitive answer for you. Wink [;)]

                        -- Jim --
                        "Put the pedal down & shake the ground!"

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                        RichardI
                        • Member since
                          February 2004
                        • From: Canada
                        Posted by RichardI on Tuesday, December 20, 2005 10:13 AM

                        Is that an acrylic? If it is, put a couple of drops of retarder in your colour cup and it should fix your problem Approve [^].

                        Rich Cool [8D]

                        On the bench: 1/48 Revell PBY Catalina 0A-10A. Next up: Moebius 1/24 Chariot from Lost in Space.

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                        thevinman
                        • Member since
                          December 2003
                        • From: CT - USA
                        Posted by thevinman on Tuesday, December 20, 2005 10:51 AM

                        If the clear coat is acrylic, then a arylic retarder will help. Also, lower the air pressure. I spray FUTURE at ~10 psi. Sometimes even lower.

                        I've found that (with Future) spraying pure windex over the model after about 5-10 minutes of drying really smooths out the finish. Not sure if the retarder or thinner for polyscale will have the same effect.

                        Temperature can also have an effect. Spraying at a very cold temp can effect viscosity.

                        -Vinny



                        My Website Macross Group Build
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                        tho9900
                        • Member since
                          July 2004
                        • From: SETX. USA
                        Posted by tho9900 on Tuesday, December 20, 2005 2:45 PM

                        Along the same lines as the windex, I use Tamiya acrylic thinner with my future to thin it out.  I get glossy coats without the sandpaper texture everytime now.  You could always try putting a little of the thinner you use with pollyscale in it and shooting it on spare plastic to see how it comes out...

                        If it doesn't work, the lower spraying pressure and/or spraying closer to the model are the best ideas I can think of.

                         

                        ---Tom--- O' brave new world, That has such people in it!
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