MARSHALLTOWN WS1728 Sharpshooter 2.1 Drywall Hopper Gun Instruction Manual

MARSHALLTOWN WS1728 Sharpshooter 2.1 Drywall Hopper Gun

PRODUCT OPERATION, INSTRUCTION INFORMATION

The Sharpshooter® 2.1 Drywall Hopper Gun, together with an air compressor, will apply most any sprayable material that can feed by gravity through the hopper. The texture that results can be adjusted in four ways.

Material Consistency

Follow the material manufacturers’ recommendations for mixing. It is important that the material be thoroughly mixed and be just thin enough to feed through the hopper. This enables the droplets of spray to stay on the wall/ ceiling surface and form a good texture. Do not thin the mixture to achieve a finer texture, rather increase the air flow and select a smaller orifice.

Orifice Size

The circular orifice plate (16) on the front of the gun provides seven different orifice sizes. A smaller orifice results in a finer pattern, whereas a larger orifice results in a more coarse pattern. To change the orifice, loosen the center knob (19). Pull the trigger back and rotate the orifice plate to the desired size. Finally, secure the orifice plate in position by first tightening the knurled nut.

Air Flow

For spraying most materials, a continuous air supply of at least 7 CFM at 25 psi is required. The air flow at the gun is adjusted by the ball valve-air line coupler (4). A reduced air flow will produce a coarser texture, a greater air flow will produce a finer texture. If the air flow is too great, however, the grains within the mixture can separate from the mixture and rebound off the walls. This can lead to waste and mess.

Trigger Setting

The position of the trigger controls the amount of material flow. As the trigger is pulled back, more material is allowed to feed through. Generally the distance between the air nozzle (8) and the mixture nozzle (7) should be slightly greater than the size of the selected orifice. For a more consistent texture, adjust the adjustment knob (12) to the desired depth. This will ensure the needle is pulled back the same distance each time so the texture remains consistent. Use the trigger lock (15) for reduced fatigue on larger projects. Releasing the trigger stops the material flow.

It is recommended that you set your pattern on scrap sheetrock or cardboard before spraying your finished product. By experimenting with the various adjustments you should be able to obtain your desired texture.

MAINTENANCE

It is important to keep the gun and hopper clean. For best results, separate the gun and hopper and flush each with clean water. The front and rear bushings (11/3) are permanently lubricated; re-oiling is normally not necessary.

REPLACEMENT PARTS

Refer to the illustration for part numbers and proper assembly. Replacement parts may be ordered individually. When re-assembling the gun the use of a silicone sealant* between the housing halves may prevent the spray material from leaking to the trigger mechanism.

• Not included, purchase separately.

APPLICATION

A few general statements should be noted

1. Always read and follow manufacturers’ mixing instructions. If not specified in those instructions, the compound should be thoroughly mixed, free of lumps, and be the consistency of pancake batter.
2. Always set your pattern on scrap sheetrock before spraying your finished product. Note the compound consistency, orifice size, air pressure at the compressor, relative ball valve position, and trigger setting for future reference.
3. The more open the trigger; the more material will be applied with a resulting coarser pattern.
4. The higher the air pressure, the finer the pattern; the lower the air pressure, the coarser the pattern.
5. The higher the air flow, the finer the pattern; the lower the air flow, the coarser the pattern.
6. Larger orifice openings will produce a coarser pattern than will a smaller opening.

Of the three most popular patterns – orange peel, knockdown, and popcorn – orange peel and knockdown generally apply to walls while popcorn aggregate is a ceiling finish. To apply orange peel: select the second smallest opening (#6) in the orifice plate, set the trigger so that the end of the air nozzle is approximately 1/4” (6 mm) from the orifice plate. Air pressure should be at least 30 psi. Again, before spraying the finished product, check for the desired texture on a scrap piece of sheetrock. To apply knockdown: also referred to as splatter, change the orifice plate to the middle opening (.315”/8.0 mm dia.) (#4), set the trigger fully open. The air pressure should be at least 20 psi. Again, before spraying the finished product, check for the desired texture on a scrap piece of sheetrock. To apply popcorn: ceiling texture, use one of the largest openings (#1, 2, or 3). Which one will depend on the size of the acoustic aggregate? The trigger setting should be fully open. The air pressure should be at least 20–25 psi.

NOTE: The textures described above are made using either a 3/8” or 1/2” I.D. hose. If you are using a 1/4” I.D. hose, use greater air pressures than specified.

SS21 (EDI No. 28295) Drywall Hopper Gun — Parts List

PRODUCT FEATURES

• 104 S. 8th Ave. Marshalltown, IA
• Phone: 800-888-0127 / 641-753-0127
• Fax: 800-477-6341 / 641-753-6341
• www.MARSHALLTOWN.com

WS1728RevA

References

• MARSHALLTOWN® - Professional Quality Tools for All

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