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what type of spayer is used to apply to a metal roof?

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asked Jul 24, 2017 in Technical by anonymous

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Equipment capable of spraying Liquid Rubber

Pump ModelMax.
Pressure
Fluid
Flow
 Hose
ID
Max.
Hose
Length
Graco GH7333500 psi3.0 gpm 1/2 inch150 feet
      
Graco GH364036000 psi3.8 gpm 1/2 inch150 feet
      
Roof
Rig
     
GunShould be rated for spraying mastics. A 30-40 inch tip extension is recommended
  
Tip Size .017 to .021 with a 12 inch fan width

Note: Do not use a “whip” between hose and gun. This reduces flow and pressure which results in poor atomization.

Thinning Liquid Rubber

The “as shipped” viscosity of Liquid Rubber is 34-37,000 cp which is too high for spraying. By adding one gallon of Xylene Solvent to a 5 gallon pail the viscosity drops to 10,000 cp at 75° F. More solvent may have to be added at lower temperatures.

The spray atomization can be improved using a smaller tip size or adding more solvent to reduce viscosity.

Wash solvent from previous pump cleaning can be used for thinning after it is strained to remove dirt.

answered Jul 24, 2017 by admin
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