In one sentence, describe what the following article is about: A basic spray paint or latex-acrylic paint will do just fine on a decorative piece or a door. Polyurethane or epoxy paint are better suited to surfaces that will see a lot of heavy use, such as boats, bathtubs, and sinks. Polyurethane paint is ready to use. Epoxy paint must be mixed with a catalyst, just like epoxy resin. The catalyst is usually sold with the epoxy paint. Most polyurethane and epoxy paints do not require primers, but most spray paints and latex-acrylic paints do. If your paint requires a primer, make sure that you buy the same kind of primer and topcoat (i.e. spray paint primer for spray paint, oil-based primer and topcoat for oil-based paint, etc.).  Check the label on the bucket or can of paint to find out if you need a primer and topcoat. Set the topcoat aside for later. If you are using the brush-on kind, simply apply it with a foam roller or a paintbrush. If you are using the spray-on kind, apply a light, even coat. Allow the primer to dry to the touch before applying a second coat. If your primer is not coming out evenly, apply it in short bursts rather than a single, sweeping, side-to-side motion. How long this takes depends on the product that you used. Some primers cure within a few hours while others take much longer. Just because the primer feels dry, that does not mean that it is cured and ready to be painted. Make sure to check the label. If you apply the paint before the primer finishes curing, the final surface may be tacky. If you are working with epoxy paint, you will need to mix the 2 parts together (epoxy and catalyst) first; other types of paint do not require any preparation. Apply the paint systematically, working from the right to the left (or left-to-right if you are left-handed), top-to-bottom. For more specific instructions:  Brush-on paint: pour the paint onto a tray, then apply it with a foam roller first. Smooth it out with a fine-bristled paintbrush.  Spray paint: apply the paint in short bursts, rather than one continuous, side-to-side motion.  How much you use of each part for epoxy paint will vary from brand to brand. In most cases, it will be a 1-to-1 ratio, but read the label to be certain. How long the paint takes to dry depends on the type of paint that you are using. Spray paint and latex-acrylic paint have the fastest drying times, while polyurethane and epoxy paint have the slowest. Most types of epoxy and polyurethane paint will not require a second coating, but spray paint and latex-acrylic often do. Apply the paint using the same method as before. Once again, just because something feels dry to the touch does not mean that it is ready to use. Read the label on your paint can. Most paints will be dry to the touch within an hour or less, but it may take several hours or even a few days before you can use the item.
Summary: Purchase the right type of paint for your surface. Purchase the right type of primer and topcoat, if needed. Coat the surface with 1 to 2 coats of primer. Allow the primer to dry and cure. Apply your first coat of paint. Let the paint dry, then add a second layer, if needed. Allow the paint to cure completely.

In one sentence, describe what the following article is about: This is of great importance in patients with sickle cell anemia. They are highly susceptible to viral and bacterial infections due to the loss of spleen function that often occurs in early childhood; therefore, in addition to prophylactic antibiotics in childhood, immunization against some diseases are also key. These include the standard childhood vaccinations, as well as immunizations against influenza, bacterial meningitis and certain types of pneumonia. There is less oxygen at higher altitudes, which can quickly trigger a sickle cell crisis if your body isn't used to such conditions. As such, be cautious if traveling to high-altitude areas (mountainous regions) and consider using supplemental oxygen if you do go.  Consult with your doctor before any trips to high-altitude areas and balance the benefits against the health risks. Only fly on airplanes with pressurized cabins (which includes all commercial flights on larger planes) and avoid flying in smaller, unpressurized aircrafts at high altitudes. It's important to keep your blood volume up, especially if you have sickle cell anemia. Low blood volume (common with dehydration) makes the blood thicker and more likely to stick or clump together and can trigger a sickle cell crisis. Prevent dehydration by drinking at least eight 8-ounce glasses (about 2 liters) of purified water per day.  Avoid drinking liquids with caffeine, which acts as a diuretic (makes you urinate more frequently) and can reduce blood volume. Caffeine is found in coffee, black tea, chocolate, most soda pop, and virtually all energy drinks. Increase the amount of fluids you drink per day if you exercise a fair bit or spend time in a hotter climate. Another possible trigger for a sickle cell crisis is temperature extremes — either getting too hot or too cold. Getting too hot increases sweating and can lead to dehydration and low blood volume. Getting too cold causes blood vessels to constrict (get smaller), which hampers blood circulation.  Stick to places and vehicles with air conditioning if you find yourself in a hot and/or humid environment. Wear clothes made of natural fibers (cotton) that can breath. Keep yourself warm in cold climates by wearing layers of insulated clothing, such as wool. Keeping your hands warm by wearing gloves is especially important for people with sickle cell anemia. Heavy-duty physical demands on your body increase its need for oxygen, which can trigger a sickle cell crisis because there's not enough hemoglobin to carry the oxygen to needy cells. Wile some regular exercise is good for health and circulation, avoid the strenuous stuff, such as long-distance jogging, cycling and swimming.  Instead, focus on low-impact exercises such as walking, light aerobics, yoga and non-strenuous yard work. Lifting light-to-medium weights is okay to build and maintain muscle, but heavy lifting is not recommended for people with sickle cell anemia.
Summary:
Focus on infection prevention. Avoid high altitudes if your body isn't used to it. Keep well-hydrated. Don't get too hot or too cold. Avoid excessive exercise.