After doing the repairs found on the pre-cover inspection the wings were sanded and prepped for filler. I did a few batches of micro and added to the wing to fill in the low area on the spar. I use a cup and add 80 grams of resin and 40 grams of hardener mix in the micro balloons until it slowly comes off the paint stick back into the cup. I find that by the time I get the last of it out of the cup it is stating to tighten up and harder to work with. This works for me in the applications. I apply the filler at 45 degree angels and then in the other direction at 45 to fill in just as the sanding method to make as level as one can get it.