G'day,
Infusion fills every crevice in the core, and is particularly heavy
when used with slit core on curved surfaces, which is where 95% of
infusion is done. Check the claims, they usually specify lighter than
hand layup.
I wet out curved surfaces with a foam roller and a squeegee. If it is
flat, pour the resin on and move it round with the squeegee, removing
all excess. For big jobs, use a wet out machine, but for a table
sized job the clean up time makes this a poor choice unless you have
another job to do at the same time.
Bog is low density filler. With peel ply the weave is filled with
straight resin, specific gravity 1.1. Bogging it fills the weave with
bog, sg about 0.3. It is also much cheaper. I would not use bog
where critical secondary laminating is required, but on the exterior
it works a treat.
regards,
Rob
On Tue, Jan 6, 2009 at 7:14 PM, Gardner Pomper <gardner@networknow.
> All the info I have seen on infusion claims to be lighter than vacuum
> bagging. Interesting to know that isn't true in practice.
>
> How do you wet out the fabric when you bag it? Just lay it down and
> apply resin with a brush? Or do you have some sort of wet out machine
> that works on 50" wide rolls?
>
> Finally, what is bog? I had gotten the impression it was a low density
> filler, but now you are referring to it as an alternative to peel ply.
>
> Thanks
> Gardner
>
> On 1/5/09, Rob Denney <harryproa@gmail.
>> G'day,
>>
>> Infusion done perfectly is the same weight as vacuuming, but perfect is
>> pretty hard to achieve, so it is invariably heavier.
>>
>> Infusion is a very neat process, but takes a lot of setting up and wastes
>> more than I like. The bigger the job or the fewer the workers available,
>> the
>> more it appeals.
>>
>> Punish yourself by cleaning resin off immediately you get it on you and
>> you
>> will soon develop clean work habits.
>>
>> The only reason I bag a polycore laminate is to get a table finish. It is
>> probably quicker to hand lay it and apply a layer of bog (or peel ply)
>> when
>> it is green to fill the weave. With foam, the bond between the core and
>> the
>> cloth is pretty poor, so vacuuming is preferred.
>>
>> None of which is a deal breaker, go with whatever you are happiest with.
>>
>> regards,
>>
>> rob
>>
>>
>>
>> On Mon, Jan 5, 2009 at 10:28 PM, Gardner Pomper
>> <gardner@networknow.
>>
>>> Rob,
>>>
>>> I am curious why you have a preference for vacuum bagging over infusion.
>>> I
>>> know whenever I get within a foot of epoxy, it gets all over me. The
>>> infusion seemed really neat, and no more effort than vacuum bagging. What
>>> am
>>> I missing?
>>>
>>> - Gardner
>>>
>>> On Thu, Dec 25, 2008 at 1:25 AM, Rob Denney <harryproa@gmail.
>>>
>>>> I am building with Polyore, under vacuum, but not infusing (too much
>>>> hassle for small panels). If it was not for the desire to get a mould
>>>> finish on the outside, I would not have bothered bagging it. I would
>>>> not
>>>> infuse Polycore or Nida for the reasons stated earlier, and would not
>>>> infuse
>>>> foam unless there were time constraints. The 15m lee hull will be built
>>>> in
>>>> one panel, 7m x 15m, hand laid and vac bagged, not infused.
>>>>
>>>>>
>>>>>
>>>
>>>
>>
>
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