thin CA works well in areas where it can be flowed , or dropped onto the sufaces , thick has its use in places like the sheeting on leading and trailing edges where it can be applied to the rib edges and it sits in a bead until sheeting is pressed onto it ,thick also works well ,if you need a little slide time , where as thin requires that the part be where it needs to be when applied ,

Hope you find this helpful .

Highlander