Before racing/exercise apply GurneyGoo™ liberally to areas prone to friction eg toes, crotch, nipples, feet, armpits, shoulders in vicinity of pack straps.
For the best protection, rub in a moderate amount 12 hours before start in addition to the liberal layer at the start.
To prevent hand blisters during long kayaking sessions: thoroughly rub GurneyGoo™ into hands up to 8 hours before start (eg night before), and no closer than 1 hour before the start of your race.
For some of us, a shower on waking on race morning is a nice way to wake up, warm up, and soothe any pre-race nerves. If you've applied GurneyGoo the night before (a great idea for maximum chaffing prevention), then a light shower won't remove the all important component of the "night -before" GurneyGoo.
The all important bit is that some GurneyGoo will remain, having had your sleep time to "soak in" to the outer layers of epidermis. A light rinse in the shower won't wash this off much at all. If you scrub with soap and flannel and hot water, then yes you'll remove 90% of this, so avoid scrubbing and keep the shower short.
So, a shower is all good so long as you don't scrub the bits you've applied the GurneyGoo to.
After your shower, give your bits a second application of Gurney Goo and you're all set to go!
The only exception is kayaking fingers if it's less than 2 hours before the event, in which case, make sure your shower is more than 2 hours before and apply Goo sparingly, and vigorously rub your hands together to heat and absorb.
If it's a long and chaffing-prone event, then you might also consider applying some goo to the clothing that can cause chaffing in addition to your skin. eg cycle chamois, running short crotch, sox, bra strap, kayak pants, etc.
Q: How many tubes will I need for a multi-day Ultra race such as the Marathon Des Sables, or The Jungle Run?
A: GurneyGoo is a prevention thing. Preventing blisters and chafing is much better than limping along in pain once it’s happened and risking injury by favouring the sore bits.
For ultra-running, smother the entire foot the night before in goo, and then again before the start of the race. Especially important if your socks are likely to get wet (river crossing, rain, drink station splashes, excess sweating, peeing on the run etc)
Same goes for other known / likely areas of chafing and rubbing, (crotch, armpits, inner thighs, pack straps, waist bands etc). It's especially good to rub crotch area if you know your hygiene won’t be so good with hours on the run, or with multiple days in the jungle and little washing. It prevents rash and infection.
So with this usage in mind, a small pocket tube will only last one or two applications for one person. It’s really designed to take out on the trail for top ups and bits you missed.
The bigger tube is designed to stay in your camp bag for application before the race, or for a team to take for the day.
As an individual runner, I’d take one large tube for my camp bag if it’s being transported for me each day.
And then one small tube for each day of running to carry on the course.
If you’re racing as a team, you’ll usually be able to share tubes to reduce the number of tubes to take.
If you need to carry all of your stuff (as in Marathon des Sables), then i’d recommend a pre-race regimen of "day-before" application, and then liberally apply heaps in the hour before the start, leaving the big tube behind. Then carry a small tube for each day of racing, applying as you feel any possible rubs spots. Remember prevention is infinitely better than cure! In fact, prevention enables finishing.