With slight magnification a green rim on the top limb of the solar disk can be seen on most clear-day sunsets. However the flash or ray effects require a stronger layering of the atmosphere and a mirage which serves to magnify the green for a fraction of a second to a couple of seconds.
Rust-OleumÂ® Specialty Chalk Board Spray converts surfaces into a usable chalkboard. Apply to metal, wood, plastic, hardboard, glass or paperboard. Erases cleanly. Indoor use only. Cleans with soap and water.
A. You would use oil-based paint if you have a build-up of old oil-based paint on the surface, say more than 3 or 4 coats. Also, if you have to apply the paint when it is below 50 degrees F, use oil-based paint. Also, if the surface is chalky and you for some reason cannot clean it of chalk, use oil-based paint.