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It is UV-stabilized. Plastic film has to be replaced every few years PET plastic has a shorter life expectancy then the non toxic LDPE plastic. It must be washed occasionally. It will not hold heat as well as glass, but is adequate for lean-tos, quonsets and small stand-alone framed greenhouses. Polycarbonate can be curved slightly around the frame and it has an energy savings of up to 30 percent, because it is double-walled. Polycarbonate is 200 times stronger than glass so it won't chip or crack during construction.Polycarbonate also has high light transmission and is UV-stabilized, but does contains toxins such as BPA's that are water soluble. Acrylic has more light transparency but is not as strong (yet still stronger then glass) 80 percent of light filters through polycarbonate. 90% filters true Acrylic. Fiberglass will turn yellow and lose transparency in a few years. Acrylic is more expensive but has higher transparency and stays clear up to 10 years. Choose clear fiberglass or even better Acrylic. It will need a new coat of resin every 10 to 15 years. Invest in higher-grade fiberglass. Light transmission is greatly reduced on low-grade fiberglass or just buy Acrylic. This will save you approximately 25% in cost compared to glass and is easier to work with. This is the most attractive material, if you are building a greenhouse that will accentuate your house or garden. Glass is very fragile and is expensive to replace when it breaks, but on the other side acrylic, fiberglass and polycarbonate needs replacing over time. You must build a framed greenhouse with a foundation, any misalignment because of settling can cause damage. Tempered glass is preferable because it is stronger than regular glass, consider using hardened glass for the roof. A 4mm thickness of float glass is suggested if you are in a area prone to hail. If you are going to the expense of installing a glass greenhouse, you should consider bids from construction companies to ensure the foundation and frame can handle the weight.

summary: Use UV-stabilized polyethylene which is cheap but contains BPA's or the more expensive but non toxic LDPE grow tarps which last for longer. Use hard, double-walled plastic such as multi wall polycarbonate or corrugated polycarbonate or the more expensive but non BPA containing acrylic (Plexiglas) which has a higher light transparency. You could buy fiberglass if you are building a framed greenhouse, you can save money by choosing fiberglass over glass as the roof construction can be lighter of construction. Choose glass.

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Tell your parents how contacts could benefit you. They could boost your confidence, or perhaps colored contacts will complete a costume you worked so hard on. Listen quietly and calmly to what your parents have to say. If you play a sport, this could be a big selling point in convincing your parents to let you get contact lenses. For example, you could tell your parents, "Hey dad, I have to take off my glasses for football practice and I couldn't see the ball." This will show your parents that contacts are a necessity for your best performance at sports. Your parents may be more willing to let you try them out for a little bit before making any big commitments. Most contact companies offer a free or discounted trial for a certain amount of time. Don't be discouraged if a particular contact doesn't work for you. Refer to your doctor for a different brand and start a new trial. It may take a few tries before you find your ideal fit. Knowledge is power! Demonstrate to your parents that you have done your research and understand how to properly take care of your contacts and your eyes. Print a guide from the internet to go through it with your parents. Offer to add more to the guide if they have questions you cannot answer. Tape it up on the fridge so they have something to look back on if they have more questions. Demonstrate awareness of germs and sanitary cleaning. Contacts can severely damage your eyes if they are not kept clean.This can be as simple as washing your hands more, or regularly disinfecting high-traffic surfaces.

summary: Discuss the pros and cons of contacts. Ask if you can try some trial lenses. Show that you will take care of your contacts.

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The first and second box on the Edit window is for your first and last name. You can click each box individually and change this information if you did not add a last name. Below your name is an option for you to enter a tagline. This is a great way to come up with a catchy slogan that describes the kind of work you do. All you need to do is click inside the box and type in your tagline. Below your tagline is an option for you to enter an hourly rate. If you click inside the hourly rate box, you can type in what you want to get paid for an hour's worth of work. The Elance fee will automatically be included into the second box. Once you enter in your hourly rate, you can click the next box, which asks for your YouTube video URL. If you do not have one, you do not have to enter anything. If you do, simply copy and paste your video link in the box. Video introductions can help prospective clients be confident in you, especially if you provide concise, well-articulated information regarding your skills; it can also help you be more credible as it would appear that you're introducing yourself to your clients face-to-face. You can click inside the next box and write a paragraph or so about yourself, the positive traits about working with you, and why you would make a good partner to work with. A service description is a summary of the types of work you are good at, where all of your strengths are. This is crucial for getting good clients. Click inside the Service Description box to begin typing in your information. The second to last box is for your payment terms. This all depends on what you personally want to put. Click inside the box and type in your terms. The final box is for selecting your keywords. These words will help clients find you easily by searching for one of your keywords. You can have between 1 and 10 keywords; to add them, just click inside the box and list 10 keyword skills, separating each with a comma. When you have finished double-checking, click on the green "Save" button on the bottom of the screen to save your profile changes.
summary: Edit your name. Add a tagline. Enter an hourly rate. Upload a video introduction. Write an overview regarding yourself. Add a service description. Include your payment terms. Select keywords. Save your changes.