I'm new to the group. One year into an ES and having just completed my FB wing kit, I'm anxious to get to the fuselage. However, before tearing down the bench to make room, I thought it would be a good idea to do at least some of the finish work on the underside of the wings. Per Carsten (Lancair ES tech) I applied 3 coats of WLS primer with a household medium nap roller. Upon sanding with a long board and shorter devices where necessary, I'm left with a variety of surfaces ranging from smooth e-glass with primer between the threads to areas of minor depressions where the paint surface was low to practically untouched areas with a full thickness of paint (and a very irregular surface.)

I'm making the following assumptions: 1) I should fill in the various low areas to make the wing 'appear' flat to my 32" sanding board - even on the bottom of the wing.; 2) whatever I do from this point, subsequent coats of paint will be sprayed.

My questions are: Are my assumptions correct? To fill the low areas can I or should I use more primer, micro, 'Super Fil', or some other filler or glazing paste such as 'Feather Fil"? How large of a pinhole or thread hashmark will a sprayed-on coat of primer fill?

I'm hoping someone says Super fill and another sanding once or twice will get me to a pre-spray stage. I've got that product and primer on hand and could actually make some progress this weekend.

I just want to get on to the fuselage but can't see doing this sanding on my back. Bob Foxwell-Minneapolis