Lets start mod the rear bumper!
Thread Starter
Instructor
Joined: Mar 2010
Posts: 107
Likes: 0
From: Vasteras
Sorry to say that not that much has happened, i started a sideproject that took all the time this weekend... 
But for the attachment i started to put tinfoil like this
Then the polyester and glassfibre!
This is someting i usually do when i dont care about the finish of the stuff, the tinfoil releases easy against the molded area.
//J
But for the attachment i started to put tinfoil like this
Then the polyester and glassfibre!
This is someting i usually do when i dont care about the finish of the stuff, the tinfoil releases easy against the molded area.
//J
Thread Starter
Instructor
Joined: Mar 2010
Posts: 107
Likes: 0
From: Vasteras
Wait and see! 
You probably seen that some glasssfibreparts are hard to get the fitment to the body, i always do like this.
I take this away and cut the "hair" away then i mount the bumper in the correct place and mold it together with this piece, then i get a perfect fitment for every bumper i take out of the mold.
If i had done this when the bumber was away from the car, the lines would be incorrect. The orignial plastic bumper is soft and the glassfibre less soft material.
//J
You probably seen that some glasssfibreparts are hard to get the fitment to the body, i always do like this.
I take this away and cut the "hair" away then i mount the bumper in the correct place and mold it together with this piece, then i get a perfect fitment for every bumper i take out of the mold.
If i had done this when the bumber was away from the car, the lines would be incorrect. The orignial plastic bumper is soft and the glassfibre less soft material.
//J
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Safety Car
Joined: Jun 2009
Posts: 3,888
Likes: 2
From: Frederick, Maryland
So what fiberglass are you using?My local stores sell cloth or mat (cloth is much cleaner looking) And whats the polyester for?I cant see where its being used.Great job man its coming along 
Thanks
Thanks
Thread Starter
Instructor
Joined: Mar 2010
Posts: 107
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From: Vasteras
I always using the fiberglass mat u see in my pics, its a very soft mat.
On the final product i usually take one layer cloth on the inside.
A good mat is the easiest way to get a good result, most cloths are hard to get formed to corners etc.
Also mix the polyster with the hardener (normally 2%) and wet the hole area before puting mat or cloth on it. When the mat comes in contact with the polyester the solvent starts to dissolve and the mat gets easier to work with. Work around and keep getting layers and layers.
//J
On the final product i usually take one layer cloth on the inside.
A good mat is the easiest way to get a good result, most cloths are hard to get formed to corners etc.
Also mix the polyster with the hardener (normally 2%) and wet the hole area before puting mat or cloth on it. When the mat comes in contact with the polyester the solvent starts to dissolve and the mat gets easier to work with. Work around and keep getting layers and layers.
//J
Safety Car
Joined: Jun 2009
Posts: 3,888
Likes: 2
From: Frederick, Maryland
Im gonna do my dash at some point soon,and from your info I assume it would be best to use fiberglass mat? when you say polyester do you mean polyester resin? Im having trouble visualizing the products your using. When you say "wet the area" you just mean with water?
to release the fiberglass from the dash without ruining it, should I shape it with the tin foil to create an easy way to pull it off?
sorry if this is getting you off track
It'll help pass time I swear haha
to release the fiberglass from the dash without ruining it, should I shape it with the tin foil to create an easy way to pull it off?
sorry if this is getting you off track
It'll help pass time I swear haha
Thread Starter
Instructor
Joined: Mar 2010
Posts: 107
Likes: 0
From: Vasteras
Im gonna do my dash at some point soon,and from your info I assume it would be best to use fiberglass mat? when you say polyester do you mean polyester resin? Im having trouble visualizing the products your using. When you say "wet the area" you just mean with water?
to release the fiberglass from the dash without ruining it, should I shape it with the tin foil to create an easy way to pull it off?
sorry if this is getting you off track
It'll help pass time I swear haha
to release the fiberglass from the dash without ruining it, should I shape it with the tin foil to create an easy way to pull it off?
sorry if this is getting you off track
It'll help pass time I swear haha
I guess Polyester resin is the same, you can choose from Polyester and Epoxy, Epoxy is for carbon parts but for fibreglass its polyester and hardener.
No, wet the area i mean with polyester, otherwise you gonna get airbubbles on the surface in your mold.
Yes you can use tinfoil and tape the edges, the thing you get in your mold is some minor scratches that you need to putty.
And one more thing - Be sure to look at the negative angels on the thing you starts to create a mold from, some molds you must do in two pieces for separating against the original part.
And the last thing, if youre planning on a finish carbon layer you need to do the fibreglass with epoxy from start, polyester and epoxy doesent match togheter.
Good Luck, send me a PM if you want some input, i think i have pictures left from some previus car i molded the dashboard on.
//J
CF Veteran
Joined: Aug 2005
Posts: 1,429
Likes: 19
From: Northern CA
St. Jude Donor '10-'12, '25
Wait and see!
You probably seen that some glasssfibreparts are hard to get the fitment to the body, i always do like this.
I take this away and cut the "hair" away then i mount the bumper in the correct place and mold it together with this piece, then i get a perfect fitment for every bumper i take out of the mold.
If i had done this when the bumber was away from the car, the lines would be incorrect. The orignial plastic bumper is soft and the glassfibre less soft material.
//J
You probably seen that some glasssfibreparts are hard to get the fitment to the body, i always do like this.
I take this away and cut the "hair" away then i mount the bumper in the correct place and mold it together with this piece, then i get a perfect fitment for every bumper i take out of the mold.
If i had done this when the bumber was away from the car, the lines would be incorrect. The orignial plastic bumper is soft and the glassfibre less soft material.
//J
Thanks. Makes sense! Awesome project. 
Thread Starter
Instructor
Joined: Mar 2010
Posts: 107
Likes: 0
From: Vasteras
The tinfoil is really easy to take away.
Use a scissor to cut your lines, after that just sand it.
Prepared for continue, next step is to place the bumper in exact right position then use polyester against this small bastards and the bumper.
Use a scissor to cut your lines, after that just sand it.
Prepared for continue, next step is to place the bumper in exact right position then use polyester against this small bastards and the bumper.
Thread Starter
Instructor
Joined: Mar 2010
Posts: 107
Likes: 0
From: Vasteras
As i want to do the final sanding outside, i have to wait for a couple of weeks so the temperature starts to go up...
So today i started fix the lower part.
Now its in the right position!
I put tinfoil against the bumper for creating the "ears" for fastening the lower part.
Also the plate thing gets me confused.... were should i put it?
So today i started fix the lower part.
Now its in the right position!
I put tinfoil against the bumper for creating the "ears" for fastening the lower part.
Also the plate thing gets me confused.... were should i put it?
Melting Slicks
Joined: Apr 2009
Posts: 2,772
Likes: 3
From: Gastonia NC
St. Jude Donor '10
