My hoses on my POS sonic are quite grippy small hole in the plastic part of the radiator so constantly adding coolant lolAs far as I know, antifreeze has no effect on rubber or it would hurt hoses and such when used in a vehicle. The whole purpose of prep is to chemically alter the properties of rubber by either softening, adding oils, strengthening etc. No antifreeze that I know of is going to do anything to rubber.
LOL! Make sure your engine oil cooler isn't leaking oil into the coolant. You'll see the hoses swell and plastics breaking down. The coolant reservoir will have crap in it as well. See it all the time, just a heads up! Happens on the 1.8's as well as the 1.4'sMy hoses on my POS sonic are quite grippy small hole in the plastic part of the radiator so constantly adding coolant lol