+1 on that. I use the StarBrite -50, but I push water out with an air compressor, run the antifreeze, push it out with air. The assumption is that the AF is possibly left in some low spots and even if it freezes (solid?), there will not be any pressure on the water lines. Worked for me over the last15 years, with temperatures dropping to almost -35 °C (almost the same in °F).
Marek 1994 C270 Legato Ottawa, ON From: Jeff Nelson via CnC-List <[email protected]> Sent: Wednesday, January 28, 2026 7:04 AM To: [email protected] Cc: Jeff Nelson <[email protected]> Subject: Stus-List Re: Cold Enough? If you are using starbrite pink it is rated for plastic water lines (-50) it will freeze pretty solid at about -23, but it doesn't expand much....they make -100 which would go to about -35 before freezing. You should read the fine print on the product you used. Plumber's antifreeze from the hardware store also has variances, so you need to watch what you pick up. I use plumbers antifreeze on my boat, flush all the water lines with it and engine etc. When I'm done, I drain everything out so should it expand it has room to do so....or at least that's my hope. Been doing it that way for the last 26 years, fingers crossed this year will be no different. Cheers, Jeff Nelson Muir Caileag C&C 30 - 549 Armdale Y.C. On 2026-01-27 17:15, John Christopher via CnC-List wrote: Canadian here with an 1983 Landfall 38. I’ve had the boat since 2017 and only 2 previous owners who both used pink stuff like me to winterize the engine, and I pour some in the bilge as well. It was -31F this last week and I’m not worried at all. /John
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