Fluid injection into your body is very serious!! When working with airless equipment, the pressure is tremendous. That pressure is concentrated to a very fine point at the spray tip. If your Hand or other body part is over that opening when the trigger is pulled, you have a fluid injection injury.
This is very serious and unfortunately most medical centers don’t know how to treat such a wound. I had one on my hand and it was terrible.
When you buy a spray gun or pump with a gun one of the many things most painters throw away is a little packet of information you should keep. I keep one in my wallet and one in the company first aid kit. If you experience this type of injury had the card to medical personnel to help them treat your injury.
The toxicity of what has been injected is secondary to the physical damage to the area. Surgical debridement of the area is the first concern and many latex paints and paints with titanium dioxide reduces your systems ability to fight infection so an immediate course of antibiotics is necessary. Fluid injection is a nasty wound and something you definitely want to avoid.
Wood grain. All wood has a grain to it. When wood is stained we are bringing out the beauty of that grain. When wood is being painted we sometimes want to minimize to appearance of that grain. A good example of this is when we are asked to paint cabinets. Either new wood or previously stained cabinets.
Sometimes this can be a challenge. Some woods like oak have a naturally open grain and on previously stained and lacquered cabinets there is often not enough lacquer to fill in the grain.
Let’s use as an example a new oak cabinet door. The best approach is to sand the wood smooth with a 220 grit paper. Next dust it off well. Next you will want to spray a fine coat of primer. We use proprietary primers and finish on our cabinet work. The scrub that primer into the grain of the wood using a quality brush. Work fast enough to not let the primer start drying. When dry you will want to sand the surface again and repeat.
We will normally do this about three times depending on the customers preference.
The next step is finish. We will spray and scrub the first coat of finish. Then sand. This last sanding we take special care to not burn any edges and we make sure to sand the surface well. Most of the wood grain will be minimized at this point.
We will spray two additional coats of finish and once, dry it will be perfect!!
Back priming is the process of priming the “back side” of material to be hung. Usually it is exterior siding. Sometimes it is interior siding or another product. The idea behind this is to add an extra layer of “security” in case water migrates to the back side of the material. It also minimizes warping of the siding.
We have done a fare amount of it but I’m neutral as far as my opinion is on the necessity of doing so. Back priming seems to be more of something a particular architect gets locked into and then never deviates from. For example many years ago we did two Pier One stores. At that time the facade was a stained lap siding with painted black brackets connecting the various posts and beams. The two stores were in different states and had different general contractors. One store they insisted the siding must all be back primed. The other store it was not a requirement.
It is a real pain in the butt to prime a piece of lap siding when you know the other side is going to be stained and so no primer can touch or run onto the other side. We got it done.
Fast forward many years and at about the 15 year mark the two buildings looked the same. A couple years later one building was torn down and the other was turned into a health clinic.
There are probably valid reasons to back prime in certain circumstances however in the real world I see little difference as long as the exposed side receives the proper prep and paint.
Mechanical equipment painting is a challenge under the best of circumstances. If doing so in an operating environment like a factory or food processing plant it is even more of a challenge.
First and foremost of concern is safety. The safety of your employees and the employees at the facility.
Most plants will have a brief safety or orientation program which attendance is required.
Don’t rely on or assume the facility has the safety equipment you will need. Safety glasses, gloves, first aid kit, eye wash, hard hats, respirators are things you should have on hand. It is also a good idea being familiar with the nearest medical facility. You don’t want to be trying to figure out where one is at if it is needed.
Always have on hand MSDS (material safety data sheets) for all products you will be using. Product data sheets are also helpful to have on hand. Your paint supplier will provide you with these if asked.
Always follow lock out procedures on equipment you will be working on. Make sure no power is running to it and it is “locked” off.
Painters are the only people that should be in the area you are working in. You can’t manage/control the facilities people.
Working in a commercial facility is a nice change of pace.