The right wing fill continues with Method B, the filling of strips in prep for the screeding between. At the same time Method A continues, old school with heaps of filler and then sand it all away.

Here we have the strips of filler carefully applied and a little sanding to lower the heights.

Just to explain this is the tool to ‘screed’ with. This dictates how far apart the strips need to be. A smaller or longer tool would mean different pile distance gaps.

After a LOT of sanding the strips were just above the wing. Next we did an ‘epoxy wipe’ a minimum amount of pure epoxy to prime the surface before the filler goes on. Yes there was another step before this. The surface was ‘energised’ with a vigorous scrub with a huge scotch-brite pad. I have no clue how much is needed here. When I do it, its not so strenuous. Michael did this one and the plane was shaking!

Technique here is everything with a mass of filler. The idea is to get it as smooth and even as possible so that later sanding is minimised. Factors like temperature and the viscosity of the mix come into play.

Our mix is 50 grams of West 105 resin, 10 grams of West 205 fast hardener and 5 grams of West 410 filler. YMMV. A timed 2 minute mix of the epoxy then get that filler in fast and make it smooth. Then out of the mixing tub as fast as you can onto the surface of the job and spread out. This stuff will exotherm faster than any epoxy I have every worked with. Hence small batches and get it on the job quickly. Two people working together gets it does efficiently, a mixing person and a spreader person.

Meanwhile back on the left wing we are doing the fill and sand and still making progress.

This is the right wing, method B after a good sand and it needs another fill. BUT with considerable refinement of the technique this may be the faster method and may be less sanding.

Back to the left wing again and it just got another fill. After a sand with the ‘stick of pain’ this will, be pretty close to OK.