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Painting problem solver
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Rai tingproblem sover Ensuring Proper Grounding When Working with an Electrostatic Spray Gun
SELECTING HIGH-QUALITY PAINT Which is a betterquality exteriorpaint, Vistaor Dunn
Q:
Edwards? My Home OWTIers Association askedme to use Dunn Edwards but the painter gave me a cost estimate for Vista paint. I now need to decide whether to keep to our original specification or accept the painter's bid.
A:
I do not keep up with the quality of individual paints and, therefore, cannot give you an opinion. However, here are some general hints that might be useful: In this competitive paint market, you usually get what you pay for. Therefore, as a rule of thumb, one can say that the higher the price, the better the quality. This axiom is not always true, but if one paint costs $10 per gallon, and another $35 per gallon, it seems reasonable to expect that the higher priced product will perform better. Why the higher price? More durable resins, pigments, UV inhibitors, mildewcides and other ingredients are used in the better quality paints. Also, higher volume solids products are more expensive since they give you greater coverage. Finally, Consumer Reports frequently publishes a comparison of paints made by different manufacturers. I suggest that you go to their website and search for their latest paint report. GROUNDING OPERATOR WHEN USING ELECTROSTATIC SPRAY GUN WJat options areavailable for groundingthe operator in a hand-held elearoscuic spraygun sysem?
Q:
:The handle of all electrostatic hand-held spray guns should be grounded. Therefore, if your painter is experiencing electrostatic shocks, your first approach should be to test that the gun handle is grounded. The best option for a painter is to hold the handle firmly in the palm of his bare, sweaty hand and make good contact with the handle. By wearing gloves the painter isolates himself from the ground and will tend to build up an electrostatic charge. If he does wear a glove, he should cut a hole in the palm, so that he can have physical contact with the handle. Alternatively,
A
www.metalfinishing.com
one can purchase conductive gloves that are suitable for electrostatic paint application. Additionally, leather-soled shoes are better than rubber soles. I have also heard of painters wearing a grounded waist band, where the band or belt is in direct contact with the painter's skin. I suggest that you go to the ITW-Ransburg website, which may offer additional literature on this topic. REPAINTING GARAGE DOORS
:Iboughtanewstee1garagedoorwithtwocoalSofbakedon polyester. Due to our condominiumrules, I need to repaint the door. Do I need to prepare the doorin some wayin order tochangethepaint color? I triedpaintingwithsatinla.tex outdoorpaint, but it doesn'tseemto adhere verywell.
Q
:Your best bet is to scuff-sand the door to a dull finish using 280 grit abrasive paper. Thoroughly wash off the dust and other dirt deposits and then use a 100% acrylic primer and top coat. High-quality 100% acrylic latex paints are designed to stand up to sunlight for long periods. Please experiment before you redo the entire door and test adhesion after a few days of exposure to sunlight.
A
PERMITIING A NEW SPRAY BOOTH :I'mmoving into a buildingand want to install and permit a new paint booth. I need know to whom I should first go and whatstepsI need to take.
Q
:Your local fire marshall will tell you exactly what he requires before issuing a permit. In addition, you might need to go to your local or state air pollution control agency. The agency might have permit regulations to which you must comply. If an environmental permit is required, vae, Hazardous Air Pollutant (HAP) and paint particulate emission limits might be imposed.
A
BIO
RonJoseph isapaintandcoatingconsultantwithExponent, Inc., ofMenio Park, Calif You may e-mail your questions directly to him at Jjoseph@exponentcom.
January 2009 I metalfinishing I 47
~.,
'.\. ~ ' .~ ./,'. - ~--"---',.
-
Rai tingproblem sover Ensuring Proper Grounding When Working with an Electrostatic Spray Gun
SELECTING HIGH-QUALITY PAINT Which is a betterquality exteriorpaint, Vistaor Dunn
Q:
Edwards? My Home OWTIers Association askedme to use Dunn Edwards but the painter gave me a cost estimate for Vista paint. I now need to decide whether to keep to our original specification or accept the painter's bid.
A:
I do not keep up with the quality of individual paints and, therefore, cannot give you an opinion. However, here are some general hints that might be useful: In this competitive paint market, you usually get what you pay for. Therefore, as a rule of thumb, one can say that the higher the price, the better the quality. This axiom is not always true, but if one paint costs $10 per gallon, and another $35 per gallon, it seems reasonable to expect that the higher priced product will perform better. Why the higher price? More durable resins, pigments, UV inhibitors, mildewcides and other ingredients are used in the better quality paints. Also, higher volume solids products are more expensive since they give you greater coverage. Finally, Consumer Reports frequently publishes a comparison of paints made by different manufacturers. I suggest that you go to their website and search for their latest paint report. GROUNDING OPERATOR WHEN USING ELECTROSTATIC SPRAY GUN WJat options areavailable for groundingthe operator in a hand-held elearoscuic spraygun sysem?
Q:
:The handle of all electrostatic hand-held spray guns should be grounded. Therefore, if your painter is experiencing electrostatic shocks, your first approach should be to test that the gun handle is grounded. The best option for a painter is to hold the handle firmly in the palm of his bare, sweaty hand and make good contact with the handle. By wearing gloves the painter isolates himself from the ground and will tend to build up an electrostatic charge. If he does wear a glove, he should cut a hole in the palm, so that he can have physical contact with the handle. Alternatively,
A
www.metalfinishing.com
one can purchase conductive gloves that are suitable for electrostatic paint application. Additionally, leather-soled shoes are better than rubber soles. I have also heard of painters wearing a grounded waist band, where the band or belt is in direct contact with the painter's skin. I suggest that you go to the ITW-Ransburg website, which may offer additional literature on this topic. REPAINTING GARAGE DOORS
:Iboughtanewstee1garagedoorwithtwocoalSofbakedon polyester. Due to our condominiumrules, I need to repaint the door. Do I need to prepare the doorin some wayin order tochangethepaint color? I triedpaintingwithsatinla.tex outdoorpaint, but it doesn'tseemto adhere verywell.
Q
:Your best bet is to scuff-sand the door to a dull finish using 280 grit abrasive paper. Thoroughly wash off the dust and other dirt deposits and then use a 100% acrylic primer and top coat. High-quality 100% acrylic latex paints are designed to stand up to sunlight for long periods. Please experiment before you redo the entire door and test adhesion after a few days of exposure to sunlight.
A
PERMITIING A NEW SPRAY BOOTH :I'mmoving into a buildingand want to install and permit a new paint booth. I need know to whom I should first go and whatstepsI need to take.
Q
:Your local fire marshall will tell you exactly what he requires before issuing a permit. In addition, you might need to go to your local or state air pollution control agency. The agency might have permit regulations to which you must comply. If an environmental permit is required, vae, Hazardous Air Pollutant (HAP) and paint particulate emission limits might be imposed.
A
BIO
RonJoseph isapaintandcoatingconsultantwithExponent, Inc., ofMenio Park, Calif You may e-mail your questions directly to him at Jjoseph@exponentcom.
January 2009 I metalfinishing I 47