There is only one high-end gel we would use. Inexpensive gels are aesthetic nightmares that prove surprisingly ineffective and very short term. High-end perching gel is an effective tool that can be used to expedite results and to establish a need for more aggressive and permanent applications. When used incorrectly, perching gels can leave unnecessary stains and more importantly, they anchor nesting materials really well. Contrary to popular opinion, perching gels are not capable of making pigeons or similar birds stick to it. Perching gel does not burn, hurt or trap pigeons, it is more like you or I stepping on a piece of bubble gum. The Pigeon Guy would start hopping around in an attempt to dislodge the gooey mess from our feet. Results can be expected for about 6-8 months in the direct sun of Arizona and about 8-10 months in the shade.