TZR Forum

TZR Specific => 3XV => Topic started by: bulldogboy on May 15, 2018, 11:21:08 PM

Title: best way to stop a fairing crack travelling
Post by: bulldogboy on May 15, 2018, 11:21:08 PM
I have a crack , about an inch long, in one of the rear panels, under the seat, which seems to be travelling. What is the best way of stopping it, obviously patch the back, but with what adhesive? and what patch) does any one know what to use, or what not to use ?( that may attack the panel) is there a specific product on the market?
Title: Re: best way to stop a fairing crack travelling
Post by: ybk on May 16, 2018, 01:20:25 AM
A bit odd but you can dissolve old pieces of fairing in acetone to create a paste that you can use to repair fairing pieces.
I have joined 2 pieces by using a soldering iron to make a groove in the crack (practice first because you can easily ruin it..) and generously using the paste as glue, filler and backing..

Otherwise fiberglass reinforcement?
Title: Re: best way to stop a fairing crack travelling
Post by: bulldogboy on May 16, 2018, 06:56:33 AM
Inventive! How long would that take to cure? I suppose once the acetone goes off it just reverts to hard plastic? Do you need to key it up with sand paper either side of the crack? Only problem is ive no broken panels, ill have to see if theres any real rough donor panels on ebay.Only bit that sounds a bit worrying is the solering iron bit! Do you need to go say 1/4 of the way through on the crack, just score it so to speak? Thanks ybk, sounds like the way foward. (-P)
Title: Re: best way to stop a fairing crack travelling
Post by: ybk on May 16, 2018, 07:59:36 AM
Cures pretty quick as far as I remember. When cured it's really hard. More brittle than the original plastic though.
Roughing up the surface would help I can imagine. Yeah the soldering iron is a bit risky, a steady hand is required but a groove will help with the strength. It's possible to even 'blend' the crack a bit but the heat will quickly bubble you the paint..
Experiment first though  ;)
I used a piece from a broken v piece as it doesn't have any paint on and is color matched. Any ABS plastic will do though, some guys use Lego blocks...
Title: Re: best way to stop a fairing crack travelling
Post by: bulldogboy on May 16, 2018, 08:14:51 AM
Lego blocks! Easier to get hold of than a donor fairing, ill give it a go, like you say experiment first, ill get some lego, and acetone, would it be adequate to scrape the crack out with a blade from the inside, soldering iron sounds scary!
Title: Re: best way to stop a fairing crack travelling
Post by: bulldogboy on May 16, 2018, 08:27:23 AM
Acetone and white lego on order, will report back with pics when repair complete, thanks for the info (-P) (-P)
Title: Re: best way to stop a fairing crack travelling
Post by: ybk on May 16, 2018, 08:30:01 AM
soldering iron sounds scary!
Haha :)) yeah, a Dremel type tool would be easier also
Title: Re: best way to stop a fairing crack travelling
Post by: bulldogboy on May 16, 2018, 09:24:34 AM
I have a dremel, will try that first, sounds more forgiving!  (-P) :P
Title: Re: best way to stop a fairing crack travelling
Post by: chubba on May 16, 2018, 09:35:36 AM
there was a 2 page how to article the other month in practical sportsbike magazine, if I find it out tonight ill try and load a photo up
Title: Re: best way to stop a fairing crack travelling
Post by: bulldogboy on May 16, 2018, 09:39:29 AM
Nice 1 chubba, any info helpfull (-P)
Title: Re: best way to stop a fairing crack travelling
Post by: nic fan on May 16, 2018, 02:46:17 PM
http://pure2strokespirit.net/forums/index.php?topic=5107.0
Title: Re: best way to stop a fairing crack travelling
Post by: bulldogboy on May 16, 2018, 04:32:16 PM
Cheers for that link, interesting ,where is "plastex" available,? Lego gets a mention again  :P
Title: Re: best way to stop a fairing crack travelling
Post by: nic fan on May 16, 2018, 05:08:57 PM
https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2060353.m570.l1313.TR2.TRC1.A0.H0.TRS0&_nkw=plastex&_sacat=0

remember to drill a hole at the end of the crack to stop it going any farther.
Title: Re: best way to stop a fairing crack travelling
Post by: evan_calgary on May 16, 2018, 06:04:54 PM
JBWeld and others make a 2-part plastic weld product.  It is the best product I have found as it still retains flexibility.  There is a grid material also available that looks like fiberglass that helps increase surface area and add some fibers to the mix.  The acetone and plastic welding are both very brittle solutions that will crack again.  The plastic weld is the next best thing to a replacement panel.  It can take continued stress without cracking or delaminating. 
Title: Re: best way to stop a fairing crack travelling
Post by: chubba on May 16, 2018, 06:11:31 PM
Could not find the one I thought I had
Title: Re: best way to stop a fairing crack travelling
Post by: bulldogboy on May 16, 2018, 09:14:53 PM
Thanks guys, very helpfull, goes against the grain drilling a hole through the fairing at the end of the crack! Suppose once fixed it can be touched in, you can see from pic its right through the decals,dont spose the decals for a 94 rs are still available are they? J.b weld sounds bit more professional than lego!
Title: Re: best way to stop a fairing crack travelling
Post by: evan_calgary on May 16, 2018, 10:30:51 PM
Don't use regular JB Weld!  Use only the plastic repair syringes.  Regular JB Weld does not adhere properly to plastic and has absolutely zero flexibility so it cracks very quickly.  The details in that article may work but they are a poor solution.  Any time you melt plastic either with heat or chemicals it gets brittle.  Plastic always flexes.  Brittle things crack.  Must repair with something with some flexibility..

Get a new decal, repair behind the decal and it will hardly be noticeable.
Title: Re: best way to stop a fairing crack travelling
Post by: bulldogboy on May 16, 2018, 11:59:40 PM
someone correct me if I'm wrong but I don't think those decals are available anymore? ok, so, I'm going with the j.b plastic weld,for the flexibility, and have ordered some fine repair mesh to span the crack and increase strength. I'm sure the lego method works,and the plastic welding works, but I take the point about the need for flexibility , not looking forward to drilling a hole in my fairings though!
Title: Re: best way to stop a fairing crack travelling
Post by: nic fan on May 17, 2018, 12:29:53 AM
I never had a problem with plastex being brittle as you can see below the left part of the V section was broken clean off it has no reinforcing it has been on the bike for well over a year and has been taken on and off several times with no ill affect.
but like with everything each has there preferences be it music, films, bikes or repairing fairings all you can do is experiment until you find something you are happy with. good luck with whatever method you use 


(https://s20.postimg.cc/cd2biaywd/P1000469.jpg) (https://postimg.cc/image/4kbnqbsx5/)

(https://s20.postimg.cc/6rkhrznl9/P1000470.jpg) (https://postimg.cc/image/ky08n7yg9/)

Title: Re: best way to stop a fairing crack travelling
Post by: thump566 on May 17, 2018, 07:41:40 AM
there was a 2 page how to article the other month in practical sportsbike magazine, if I find it out tonight ill try and load a photo up

Just thinking the same as I saw an article there too. If I locate a different one to yours will post it up. I bought a bundle of cracked OEM panels a while back in Southampton so will need to go down this route also.  (-P)
Title: Re: best way to stop a fairing crack travelling
Post by: evan_calgary on May 17, 2018, 05:54:41 PM
Possible Plastex is a similar product.  Is it a 2-part epoxy-like substance?
Title: Re: best way to stop a fairing crack travelling
Post by: bulldogboy on May 19, 2018, 08:01:45 PM
J.b weld turned up today and the numpty sent orange instead of white, so the jobs on hold, grrrrr
Title: Re: best way to stop a fairing crack travelling
Post by: Steveog on May 20, 2018, 07:17:45 PM
Here's another option that is inexpensive, easy and cures in about 5 minutes. Rough up the surface around the crack and wash clean with water. Then, open up the backside of crack with a Dremel tool. Not much. Just as YBK described. Blow dry. Put a piece of Gaffer tape on the visible side to hold the joint together, as tight as possible. (Do not duct tape, but get the stuff Film and TV gaffers use. Its properly adhesive, but tends not to pull off paint when removed).

Now, using the "original" super-glue, liberally lay down enough to fill the groove you've made on the back side. No worry if you over do it a bit. Then, quickly cover the super glue with baking soda. Acting quickly, blow off excess baking soda, then repeat with another, more copious dose of super glue and more baking soda. You need to have this compound laying over the crack by about double its original width. Blow off excess.

I have no clue to the magic of the chemistry behind this mix, but it is much stronger than the original plastic. It is very hard, but if done properly, the plastic will break in another spot before this bonding compound.

I've used this to fix many plastic parts over the years, including throttle housings. The trick is a rough, but clean surface before application. Absolutely, no petroleum or even oil from your fingers. Also, be careful to not let this stuff glue you fingers together. Surgical gloves are recommenced. This stuff can be sanded and Dremeled, but read warning below.

Warning: Do not breath the fumes that are created during the application process or during grinding or smoothing. It is much like sticking a piece of green Wasabe up you nose...I imagine.
Title: Re: best way to stop a fairing crack travelling
Post by: bulldogboy on May 22, 2018, 06:52:41 AM
Interesting stevog, loads of ways to skin a cat it appears, thanks for all the tips guys will report back when job done.
Title: Re: best way to stop a fairing crack travelling
Post by: teezer250 on May 22, 2018, 02:49:02 PM
Plumbers solvent weld should also be okay as the pipe is made from ABS.