As I mentioned earlier, I mix mine with a bit of bread crumb and have not found any detrimental effect using with some added but don't go overboard either trying to make 10 baits into a 100!
You can use crab cart on it's own or as a 'cocktail'. Depending, as a sea fishing bait it can out-fish most other baits on it's day but it is certainly NOT the be all and end all as some have you believe.
It does tend to wash out fairly quickly but if the fish are there then that shouldn't be a problem. I like to use it as an attractor in combination with another bait, lug, squid etc.
I have a wide mouthed flask I take with me, a few frozen baits in there then take a few out as and when needed.
I like to use them on a pennel rig, pierce one on the top hook and then thread a lug, rag or squid on the bottom hook, lay the crab cart along side the top hook and whip on using a bit of elasticated cotton. Being a bit on the tight side I get my elasticated cotton from a fabric shop, normally called (shearing elastic) in a fabric shop for a fraction of the cost most other tackle shops would charge. Why is it, if you want something for a hobby then the price HAS to go up?
Crab cart will account for most species of fish but does excel when fishing for cod. Try it and you might just find out what the 'whitby' lads have known for years but being 'canny' have kept to themselves...until now!
One last point, do make sure you keep this well away from the wife's food in the freezer if you don't have a freezer in the garage etc for your own use or a divorce could easily be on the cards because as I have already mentioned, this stuff really DOES smell when defrosted!
Happy fishing.....Whitby Sea Fishing