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While punks in the 80s used crazy products like glue and starch to keep their mohawks solid, there are plenty of sprays nowadays that won’t damage your hair. Use a hair spray with a tagline like “concrete”, “frozen”, or “solid”, or with a description of extreme styles with height. To make the tips of your spikes pointier and resistant to fraying, grab a gel as well. Again, look for "max hold" or "freezing" gels. Hairspray will form the basis of the hold for you style, but gel is only for the tips of your liberty spikes or outside edge of your mohawk. While gel gives a lot of hold to shorter styles, it's too heavy to use as a main product, and will cause your mohawk or liberty spikes to fall over.
Look for a good hair spray. Get a gel for the tips of your spikes or mohawk. Use gel only on the tips.