There are a few basic rules that should be followed to ensure correct adhesion of the vinyl to the substrate.    Thorough preparation is the best way to obtain successful results. It is essential that the surface of the substrate is free from oil, grease, wax, tar, dust and other contaminates.  This is a simple process and only takes a few minutes, first wash the substrate thoroughly with soapy water, this will remove the dust and dirt. The next step is to remove any petrochemical contaminants such as tar, wax and grease, this can be done by using readily available automotive products found in most motoring shops. The time taken in preparation is the key to success, leaving contaminants on the surface of the substrate is the most common reason for the vinyl failing to adhere.

Vinyl Application

As a general rule vinyl graphics and lettering should be applied within the temperature range of 8 to 32 degrees Centigrade. Under hot conditions, water can be used to cool the surface, and cold surfaces can be warmed carefully with a heat gun or hair dryer. (Only a gently heat should be applied to prevent damage to paintwork etc.)  Static can be a problem but it is easily overcome by using anti-static wipes, or a light misting of Isopropyl alcohol, water or application fluid.

All graphics supplied by Willow Signs for DIY application are pre-spaced on silicon release paper with transfer tape, ready for application to substrate. There are two basic methods of vinyl application, "wet" and "dry".  The dry method requires a fair amount of skill and experience and so the preferred method for DIY use is the "wet" technique.

Vinyl Application "Wet"

Correct positioning is important, and so the graphic should be positioned prior to removing backing paper to ensure correct alignment of graphic to substrate, masking tape can be used to mark reference points.  

Use a piece of masking tape along the top of the decal, half on the transfer film and half on the substrate ensuring correct alignment to the reference points. The tape will act as a hinge on the top edge of the decal. 

Lift the decal on its hinge and pull back a small section of the release backing paper. Spray the back of the decal with application fluid using a hand spray bottle. (The substrate could also be sprayed) 

Remove the backing paper and allow the decal to return to its original position. Using a squeegee, start from the top centre, using horizontal strokes to the edge of the decal. Continue with firm strokes from the centre to the edge, down to the bottom of the decal, enduring all air is expelled from behind the vinyl to achieve a good adhesive bond.

Allow ten minutes for the adhesive to cure. Spray the transfer paper with water or application fluid and allow it to penetrate, this should take a few minutes depending on the weather conditions and humidity. Spray the paper once more and allow another minute before removing the transfer paper. To remove the transfer paper, start at one corner and pull back at an angle of 180 degrees. Once the paper is removed, check the decal for correct adhesion, air bubbles and creases. The decal can be rubbed down again with a felt squeegee or place the silicon release paper over the decal and use the plastic squeegee. Note. Never use the plastic squeegee directly onto the vinyl. It will mark the vinyl. (You have been warned)

Pricking the bubble with a pin and then using the squeegee to push the air towards the pinhole can remove small air bubbles. (Use a felt squeegee or finger pressure).

Rivet Heads. Air bubbles may occur around rivet heads on vehicle, use the above instructions to remove the air. In cold weather the use of a hot air gun or hair dryer will aid adhesion of the vinyl around the rivet head, use a felt squeegee and do not over heat the vinyl. (Less than 50 degrees Centigrade)