Tony Krzyzewski wrote:
>Were you happy with the finsih you got on your wings using the notched
>sawblade method?
Yes, but we've had our troubles.
- It is very tempting to sand the ridges to far down, if you see the weave
through the sanded ridges then you've gone too far (probably 0.2mm too far).
- It is best to make the ridges a little bit higher than we did (see the
pictures at: http://www.loginet.nl/europa/eurofini.htm)
- Use 80grid or 120grid to sand the ridges down, anything more coarse will get
the ridges down so fast that you are in trouble before you know it.
- Fill the gaps between the ridges generously.
- Do not use a lot of pressure, use the ridges just as a guide.
- Use a large ruler or sawblade (30" or so) to fill the gaps.
- Don't be afraid to bring up too much filler, thick is no problem, too thin
means doing the whole process again.
- It is tempting to use a rather wet filler; less pinholes, doesn't roll up,
but it is also heavy, not easy to sand and the result looks more like a
wavy ocean than like a nice flat Dutch polder.
- Leave the first 5 inches from the root of your wing without filler, do this
part after you've sanded your wing and you are certain that there is no extra
filler needed.
- If you do need extra filler then bring up a whole new (thin) layer, do not
add filler locally except to the very last stage.
- Start with 36grid paper to sand down thick layers.
- Experiment with the lower surface of your tailplane.
- SP systems has fast hardener, using this you can bring up filler in the
evening and sand the next morning.
- We wanted the lower surface of our wing to be just as beautiful as the
upper surface, but if you don't often fly at low altitudes you can just
fill the weave. If you don't tell they don't see ;-).
Good luck!
Henk & Bart #264
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