Go Back   EcoModder Forum > EcoModding > Aerodynamics
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 11-18-2012, 03:03 PM   #161 (permalink)
EcoModding Lurker
 
Join Date: Jun 2010
Location: Central NY
Posts: 23
Thanks: 0
Thanked 4 Times in 4 Posts
The thing to remember with epoxy is the hardener is not really a catalyst like with polyester resin. The ratio of A to B must be exact since the molecules need to cross link with each other. Extra of either part means molecules lying around with nothing to cross link to. In other words it may feel hard eventually but it won't have the same properties and strength. It may not matter much in a non stressed area of course.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 11-18-2012, 04:07 PM   #162 (permalink)
ron
Master EcoModder
 
Join Date: Nov 2011
Location: slo county ca.
Posts: 277

double eagles - '99 Dodge ram slt
Team Cummins
90 day: 19.48 mpg (US)
Thanks: 24
Thanked 17 Times in 16 Posts
the hardener was with poly resin as i recall 1986-7 we made containers for aircraft ,I didnt do the digging the layup dept did that . It was one of there x employees that sabotaged the tank . and without it they didnt work. I didnt know the dif between epoxy and poly thanks JRP3 .
  Reply With Quote
Old 11-20-2012, 01:58 AM   #163 (permalink)
B.O. Zen
 
Join Date: Feb 2009
Location: Folsom, CA
Posts: 208

Pickup - '99 Toyota Tacoma 2wd, Regular Cab, Short Bed
90 day: 34.62 mpg (US)
Thanks: 130
Thanked 140 Times in 59 Posts
The resin got hard enough that I could sand on it, so I decided to call it good and use the part. It's not structural anyway. I mixed up a bit more resin and finished saturating the glass that wraps around the edges (pictures next post) and got started on the other side. If all goes well, should be doing body filler and primer in the next week. I don't expect I'll get much done over Turkey Day weekend.

Oh, I found that epoxy resin does not seem to loosen masking tape along the edge of fiberglass... it might be different with polyester resin, but all the bits of tape I used on this piece are a part of it now. :`}
__________________
  Reply With Quote
Old 11-20-2012, 02:00 AM   #164 (permalink)
B.O. Zen
 
Join Date: Feb 2009
Location: Folsom, CA
Posts: 208

Pickup - '99 Toyota Tacoma 2wd, Regular Cab, Short Bed
90 day: 34.62 mpg (US)
Thanks: 130
Thanked 140 Times in 59 Posts
Oh, I also cut some pieces of lexan and glued them into the air holes in the plastic valence below my bumper! Progress!
__________________
  Reply With Quote
The Following User Says Thank You to a8ksh4 For This Useful Post:
aerohead (11-21-2012)
Old 11-20-2012, 04:20 AM   #165 (permalink)
Not Doug
 
Xist's Avatar
 
Join Date: Jun 2012
Location: Show Low, AZ
Posts: 12,186

Chorizo - '00 Honda Civic HX, baby! :D
90 day: 35.35 mpg (US)

Mid-Life Crisis Fighter - '99 Honda Accord LX
90 day: 34.2 mpg (US)

Gramps - '04 Toyota Camry LE
90 day: 35.39 mpg (US)

Don't hit me bro - '05 Toyota Camry LE
90 day: 35.79 mpg (US)
Thanks: 7,217
Thanked 2,217 Times in 1,708 Posts
This has been a very interesting read. Very impressive!
  Reply With Quote
Old 11-20-2012, 11:50 PM   #166 (permalink)
B.O. Zen
 
Join Date: Feb 2009
Location: Folsom, CA
Posts: 208

Pickup - '99 Toyota Tacoma 2wd, Regular Cab, Short Bed
90 day: 34.62 mpg (US)
Thanks: 130
Thanked 140 Times in 59 Posts
Alright, here are some results from last night's work. I had started the other day by pouring resin in the middle of the front of the passenger side panel. Last night I worked resin in around the edges of the front and around the back. Had to just use my rubber gloves to work most of the stuff on the back because it was odd shapes and folds and kinds of messy. All of the surfaces that are visible from outside the truck came out pretty clean.






I found a better way to drape the fabric over the driver side panel so that I don't need to make any cuts, except at the corners to cut down on bulk on the back. It's amazing how much this twill weave can be contoured around weird stuff:


And the resin hardened in the middle of the second panel:


I think that the mix ratio wasn't as bad as I had thought on the first panel. Once the second batch was applied to the rest of the fabric around the edges and onto the back, the middle tightened right up (didn't add any additional resin to the middle). I think that, maybe, having tension on the fabric from getting it wrapped all the way around took some of the give that I was feeling out of the middle of the big smooth front surface.
__________________
  Reply With Quote
The Following 6 Users Say Thank You to a8ksh4 For This Useful Post:
aerohead (11-21-2012), bespurcell (11-10-2014), bryson (11-21-2012), KamperBob (11-21-2012), NeilBlanchard (11-30-2012), slowmover (11-22-2012)
Old 11-30-2012, 02:04 AM   #167 (permalink)
B.O. Zen
 
Join Date: Feb 2009
Location: Folsom, CA
Posts: 208

Pickup - '99 Toyota Tacoma 2wd, Regular Cab, Short Bed
90 day: 34.62 mpg (US)
Thanks: 130
Thanked 140 Times in 59 Posts
I got a little more work done on the 2nd panel this evening. It's looking a lot more clean than the first one.


The adhesion isn't going to be super good on the back, but I'll be able to trim out the couple of big wrinkles when it cures. I didn't use any peel-ply type stuff this time. I just wet the fabric down and pulled it around the edges. It seems like the sharp edges came out really clean this way. The peel ply might still be a good idea for any flat surfaces like the back.
__________________
  Reply With Quote
The Following User Says Thank You to a8ksh4 For This Useful Post:
NeilBlanchard (11-30-2012)
Old 11-30-2012, 09:25 AM   #168 (permalink)
Master EcoModder
 
NeilBlanchard's Avatar
 
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,907

Mica Blue - '05 Scion xA RS 2.0
Team Toyota
90 day: 42.48 mpg (US)

Forest - '15 Nissan Leaf S
Team Nissan
90 day: 156.46 mpg (US)

Number 7 - '15 VW e-Golf SEL
TEAM VW AUDI Group
90 day: 155.81 mpg (US)
Thanks: 3,475
Thanked 2,950 Times in 1,844 Posts
Question: what are the weights of the fiberglass fabrics that you are using? Just curious - and where did you buy them?
__________________
Sincerely, Neil

http://neilblanchard.blogspot.com/
  Reply With Quote
Old 11-30-2012, 12:13 PM   #169 (permalink)
B.O. Zen
 
Join Date: Feb 2009
Location: Folsom, CA
Posts: 208

Pickup - '99 Toyota Tacoma 2wd, Regular Cab, Short Bed
90 day: 34.62 mpg (US)
Thanks: 130
Thanked 140 Times in 59 Posts
The fabric is 8.8oz twill E glass. I also got some 6" wide 9oz stuff that I'm planning on using to back up any corners and edges that I want to be stronger. They're from TAP Plastics.
__________________
  Reply With Quote
Old 11-30-2012, 01:07 PM   #170 (permalink)
Do more with less
 
Join Date: Jul 2010
Location: North Eastern Missouri
Posts: 930

OD - '05 Ford Econoline
90 day: 18.64 mpg (US)

Joetta - '86 Volkswagen Jetta Turbo Oil Burner
TEAM VW AUDI Group
90 day: 49.71 mpg (US)

Benzilla - '85 Mercedes Benz 300D
90 day: 28.08 mpg (US)
Thanks: 66
Thanked 177 Times in 112 Posts
I would recommend that you lay the fabric on the bias. It will conform better. If you use a second layer or more change the angle of the fabric threads to improve overall strength.

__________________
“The further a society drifts from the truth, the more it will hate those that speak it.” George Orwell

“Before a standing army can rule, the people must be disarmed; as they are in almost every kingdom in Europe.

The supreme power in America cannot enforce unjust laws by the sword; because the whole body of the people are armed.”

Noah Webster, 1787
  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com