The middle layer is the vinyl lettering.
Installing vinyl lettering on glass.
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Vinyl lettering lasts up to eight years depending on the quality.
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Vinyl lettering can be applied to glass wood metal drywall and any other smooth surface.
This article explains how to install vinyl lettering or how to install any cut vinyl decal which differs from a flat decal.
Manufacturers do not recommend attempting to apply vinyl to glass when the air surface temperature is less than 40 degrees fahrenheit because the adhesion will not stick.
The top layer is masking tape which holds the letters in place for easy installation.
Eventually the glass could actually explode because of the prolonged intensity of the heat cold weather also plays a role in vinyl application to glass.
The bottom layer is the white wax paper backing which protects the vinyl lettering and the adhesive.