It's Not a Part-Time Job
The chemicals (specifically the A side, ISO) are very problematic if they are allowed to sit in your equipment for any length of time.
Your equipment will provide you with many years of trouble-free service if it is used frequently.
There is no easy way to clean out the lines and store spray foam equipment.
Iso (A side) will start to form crystals in the hoses if it is allowed to sit in the equipment for more than a couple weeks. It needs to be kept away from air and water. You can recirculate the A side material back into the drum if you do not have a job and your equipment is going to sit but this is a short-term solution. You cannot just recirculate every couple weeks and think that is going to keep your equipment in good condition.
People often ask if they can just buy chemicals to clean out the lines and store the equipment. The short answer is yes, but it is not that easy. ISO interacts with many chemicals so it must be neutralized, then flushed with a powerful chemical, and then we would need to use a storage chemical in the hoses. This is a very difficult process to get right. One mistake in this process and the hoses that we are trying to protect will clog. The same chemical that is used to clean out the heated hoses will eat the plastic cup seals that are used in the transfer pumps and the booster pump on our machine.
The reality of spray foam is that if you are going to invest in this equipment you need to find a way to keep it working or sell it. It is not an airless paint sprayer. You cannot clean it out and store it. Do not buy this equipment if you just want to do your own house, garage, metal building, or whatever else.
