Yes, it works well with that.
you should use oil based paint for the shelf portion of cabinets. i made the same mistake.
the continental shelf-edge or shelf-break
I don't know how envolved you want to get but, your problem is the plastic will flex and the paint will chip and peel, you need two (2) things, a bonding agent (to make the paint stick to the plastic) and a flex agent (to make the paint stretch). you can get these at a automotive paint store. Its a little envolved but I have never had a problem with peeling or chipping paint on plastic. NOTE: Car bumpers are painted this way. OOP'S, Enamel paint is just fine
Shelf is a noun.
The finish achieved with paint can be affected by: * Temperature as it is painted and dries - too cold and it may go "chalky" or not dry properly, too hot and the thickness of the paint may be affected, or brush marks may be more obvious. * Surface preparation - a variable surface will give a variable finish. Check for a clean, dry and even surface free of loose material like dust or flakes. * Paint age - Has the paint been on the shelf a long time, or got to hot or cold at some point? * Paint mixing - Was the paint well stirred and mixed without bubbles? * Is it the correct type of paint for the material being painted? * Was the brush or roller clean?
To effectively paint a Kallax shelf unit for a fresh new look, follow these steps: Clean the surface of the shelf unit thoroughly to remove any dust or dirt. Sand the surface lightly to create a smooth base for the paint to adhere to. Apply a primer to the shelf unit to help the paint stick and prevent chipping. Choose a high-quality paint in the color of your choice and apply it evenly with a brush or roller. Allow the paint to dry completely between coats, following the instructions on the paint can. Consider adding a clear coat or sealant to protect the paint and give the shelf unit a polished finish. Let the shelf unit dry completely before placing any items on it.
You can paint shelf liner but it may not look so good if it starts to lift.
Polyurethane is a very tough Plastic and is solid at room temperature so the shelf life, at room temperature, Liquid form, still a long time, for furthur answers and for further Elaboration consult The New MrSpock (Xbox Live Gamertag).
There are many cool and simple DIY projects. Make a new floor by painting a rug on the floor with craft paint and sealing with polyurethane. Make a dressing table with a shelf attached to the wall with brackets and add a mirror and skirting.
Although you can paint the shelf with paint pens, it would take longer to do than if you used a brush or spray. It would more than likely also cost you more.
heat
Yes, polyurethane can degrade over time due to exposure to light, heat, and oxygen, which can cause it to yellow, become brittle, or lose its effectiveness. It is important to store polyurethane properly and use it within its recommended shelf life to ensure optimal performance.
matter of taste do what you like
Latex paint typically has a shelf life of about 10 years before it expires.
Paint typically has a shelf life of around 2-5 years before it expires.
To make shelf brackets out of 2x4s, you can cut the 2x4s to the desired length and angle, then attach them to the wall and shelf using screws or nails. Sand the edges for a smooth finish and paint or stain them if desired.
Officially, 6 months after opening. I have found finishes to be very expensive and shelf life is very important, I use a product called "Bloxygen", it contains an inert gas (Argon) that lays on top of your polyurethane not allowing oxygen in, thus extending the shelf life of your opened can of poly. In practice, polyurethanes will slowly polymerize in the can, forming a globby layer of cured poly, and slowly thickening the liquid poly underneath. I have not had any problems with chipping through the cured layer and using the remaining viscous product. Eventually (after several years in an opened can) it becomes difficult to even spread the thickened coating onto wood, contains unsightly bits of solid cured material, and I suspect it won't penetrate wood as well, but it does seem to dry and cure properly. That's all with an open can. Unopened, solvent-based coatings like polyurethane have a quite exceptional shelf life. I have used decades-old rusty sealed cans of polyurethane, and they appear indistinguishable from current production!