Equipment capable of spraying Liquid Rubber
| Pump Model | Max.
Pressure | Fluid
Flow | | Hose
ID | Max.
Hose
Length |
| Graco GH733 | 3500 psi | 3.0 gpm | | 1/2 inch | 150 feet |
| | | | | | |
| Graco GH3640 | 36000 psi | 3.8 gpm | | 1/2 inch | 150 feet |
| | | | | | |
Roof
Rig | | | | | |
| Gun | Should 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.