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I believe that I saw that you could brush it on. Might try their website FAQs
Important: Manufacturers Recommendations
For best results, LizardSkin must be applied with a recommended spray gun/nozzle at 50-70 psi air pressure. For specific recommendations, consult product label. Brushing is recommended only for small area touch up.
I used the Lizard Skin spray gun for 99.9% of my project and highly recommend using it, but when I did my door skins I just brushed on multiple light coats, as I did not have the spray gun handy that day. Seemed to work okay for a small area.