Measure to Apply Proper Thickness
Measure carefully an area that is exactly 5 ft. x 10 ft. = 50 sq.ft. (1.52 m. x 3.05 m. = 4.64 sq.m.), and be sure to apply one (1) full gallon (3.79 L.) within that area; or measure exactly 10 ft. x 25 ft. = 250 sq.ft. (3.05 m. x 7.62 m. = 23.23 sq.m.), and be sure to apply five (5) gallons (18.95 L.) within that area. Don't guess! Measure to be sure, because proper thickness is the key to a successful waterproofing application, hurricane force wind and rain resistance, and long term durability.
Brush or Broom Application
On residential roofs, an easy, practical and effective application method is to use a broom with long, very soft plastic bristles, laying the SOMAY "ROOF MASTIC"® onto the surface at the proper thickness to create a continuous, seamless, waterproofing membrane.
Roller Application
On small roof areas, a very smooth, very short nap (1/8") roller can be used if you work very slowly and with very light pressure on the roller, so as not to "whip" air into the coating causing "bubbles" to develop on the surface. Remember, the objective is to apply the proper thickness of coating, NOT to spread out the coating like a normal paint.
Airless Spray Application
On larger roof surfaces, SOMAY "ROOF MASTIC" may be applied using very heavy- duty airless spray equipment. The following airless spraying system is recom-mended by Graco for spray application:
A - Airless Spray Pump
Graco Name |
GM 5000 |
Graco Part Number |
231-052 (Complete) |
Power System |
Gasoline - 5½ H.P. |
Material Delivery |
(Max.) 1.25 Gallons Per Minute (GPM) |
Max. Fluid Pressure |
3,000 Pounds per Square Inch (PSI) |
B - Gun Model
"Silver Plus" Airless Spray Gun, Model No. 235-463, for medium and heavy viscosity coatings. Rated at 5,000 Pounds per Square Inch (PSI) max. fluid pressure.
C -Tips
RAC IV, "Reverse-A-Clean" Switch Tips
Spray pattern (fan) width at 12" = 12" to 14"
Sizes: Preferred orifices: 0.023 or 0.025 (Min. orifice 0.019 with 3 guns;
Max. orifice 0.035 with one gun)
Orifice Size (in.) |
"RAC IV"
Tip No. |
Flow Rate (GPM) |
.019 |
221-619 |
0.36 |
.023 |
221-623 |
0.55 |
.025 |
221-625 |
0.66 |
.035 |
221-635 |
1.31 |
D - Fluid Material Hose
Size: 3/8" or 1/4" Inside Diameter wire braid reinforced spray hose for
Airless Mastic Gun Supply
GM 5000: from 50 feet to 300 feet of material hose
Part No. 214-705 - 50 ft. - Max. Working Pressure: 3,000 PSI
Note: Pressure drop per 50 ft. of hose will be approx. 400 to 550 PSI
For Graco technical assistance on spray equipment: Toll free: 1-800-367- 4023
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