Water pump leaks from rear cover in low temps.Will repair kit fix it?

[Redland1]

My water pump is leaking when temps are in the teens and below.Will lose about a gallon in two days of low temps if the truck hasn’t moved.When the temps get back up into the 30’s it doesn’t leak.Looking at the minor repair kits like this one https://highwayandheavyparts.com/i-23901...s-new.html And wondering if it will fix it.Also what does it take to get to that back cover?