Just one more question: is there a socially-sanctioned solvent for cleaning up 
the residue left behind by old yucky tape? (I assume that cleaning it up is a 
good idea before bonding with contact cement, yes?) I'm thinking acetone, but 
others with more experience may have better ideas…

Thanks,
Steve

On Jul 8, 2013, at 8:21 AM, Steve Upstill <st...@upstill.net> wrote:

> Thank you, Jacob! This is most useful. (…and I hope I'm not intruding too 
> much on group bandwidth by thanking in public.)
> 
> Steve Upstill
> On Jul 7, 2013, at 10:45 PM, Jacob Rodriguez <fractalsp...@gmail.com> wrote:
> 
>> Sorry, not sure about "tap plastics". The stuff I'm buying is used for 
>> covering furniture, or used as storm windows or whatever. Marine vinyl is 
>> really good. I used to think it was 4 gauge vinyl, but it's actually 12 
>> gauge. Probably best to make sure it's UV treated, but mine doesn't say 
>> specifically and is proving itself quite well outside for the past month or 
>> so. No cracking or getting hard or anything. Anything that is sold to be 
>> used outdoors is what you're looking for.
>> 
>> Here's a link to Amazon to give you an idea of what you want: 
>> http://www.amazon.com/No-Manufacturer-Gauge-Clear-Vinyl/dp/B003ZFA4LM/ref=sr_1_1?ie=UTF8&qid=1373261515&sr=8-1&keywords=12+gauge+vinyl
>> 
>> I've also just updated a document that explains a lot of stuff here. One 
>> thing I just learned is not to use the "eco friendly" contact cement that 
>> cleans up with water. Use the hardcore stuff. I'm all for saving the 
>> environment, but the 'Woodweld' in a green can is not what you want (takes 
>> too long to get tacky and dry). Find the "original" stuff in the red can if 
>> you can.
>> 
>> Using 4 vs 6 inches is up to you. I'm personally going with 4 inches for my 
>> tight hinges (giving me 2 inches of contact on either board) and then 7 inch 
>> strips on my loose hinges (3 inches will be taken up by my board thickness 
>> (1.5"), and then 2" on each surface). In my experience, that seems to be 
>> plenty strong. See my tests (labeled "Test") on various things. Those 
>> prototypes only have 1.5 inches on each board, and some of that is over 
>> masking tape, reducing their adhesion; they hold up pretty well. Though it 
>> never hurts to overbuild, and if you're doing a regular hexayurt, you won't 
>> use too much, so why not? On my quad dome, I have something like 136 
>> joins/edges that need to be done, so I will require about 31 yds of the 
>> stuff. Something like that anyway.
>> 
>> Have fun!
>> 
>> 
> 

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