Advice needed on spray/handling equipment for coatings & insulation

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I’m based in Canada (started as a side project and got some requests to work on other houses too). Turns out many homeowners want to insulate their houses, so I’m at the point where spray equipment for coatings and insulation feels necessary. I see options from basic airless sprayers to rigs for foam, waterproofing, or fireproofing. For those of you who’ve been through this - do you usually invest in your own systems, or rent/contract out when the job calls for it? And if you do buy, do you s...