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On 2006-05-30 09:12:03 -0400, "dadiOH" said:

wrote:
Hi,

I posted here previously and received some extremely helpful advice so
I'm back for more ;-)

I just started to build Water Wheels and sell them. However, I am no
expert at using epoxy and various protective finishers & Sealers for
Wood. I use 3/4 inch Marine Plywood for my Water Wheels (with 12mm
Marine Ply used for Water buckets).

Once the Water Wheel is completed and assembled, I then...

- apply the epoxy first against the bare wood (encapsulating the
product in 2 coats of epoxy)
- wash and sand the epoxy coat to get rid of the water soluable Amine
and ensure the epoxy will bond to the primer coat
- apply 1 Marine grade primer paint
- apply 1 Marine grade color topcoat
- apply another topcost of a differnt color to the sides of the wheel
via a design template

[Optional]:- then finish it with a UV resistant varnish to avoid
sunlight epoxy degradation.

Superfluous...the thing is already painted and the paint blocks UV from the
epoxy.
______________

These are some of the problems I am encountering and questions I have
so far;

3. The Marine Plywood is difficult to work with, expensive, causes
burning sometimes whilst routing and chips easily.

There is no particular reason to use marine ply, you can use plain old
exterior ply. The difference (other than price) is that the exterior ply
will probably have voids in the internal plies. Since you are epoxying them
anyway, not much of a chore to mix in some Cabosil in the epoxy and fill any
voids that show.
__________________

4. I'm thinking about steam bending some parts of the Water Wheel such
as the Water Wheel buckets. I heard that Marine Plywood would be more
suited to this? Can anyone clarify?

Generally, plywood doesn't bend well because of the crossply construction.
There *are* special ones made for bending, don't know if they come in
marine/exterior grade or not.
________________

5. I seal the Water Wheel with an epoxy resin (mixed with a hardener)
using a brush and a gloss roller but this is extremely time consuming,
difficult to apply to hard to reach places and sets very fast. The
brush and roller (and any other tools used) are unusable afterwards.
What can I use to thin it out?

Lacquer thinner for thinning. Vinegar works well as a cleaner.

You might want to do the epoxying before assembly; or even cutting,
depending on waste. Much easier to apply if it can be poured onto a flat,
horizontal surface and it can be poured thick enough so all you need is one
coat. I use a foam roller cut in half length ways to smooth it out and get
uniformity. The foam edge of the roller can also be used to "tip it off" to
get rid of air bubbles but a better and faster way is by quickly passing the
flame from a torch over them so that the air in the bubble expands and
bursts the bubble. Keep in mind that epoxy is flammable.

The main problem with this suggestion is that you will need to go back
and re-coat the water wheel once it is assembled. The work you do in
cutting and assembling the waterwheel will destroy the epoxy coating
that is protecting the wood from moisture/water intrusion.

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