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Author Topic: Project xs750 lowrider  (Read 7561 times)

Offline Markie-V

  • Posts: 89
Re: Project xs750 lowrider
« Reply #70 on: Apr 12, 2018, 21:04:40 »
d9Canada...

I just did a test patch with bondo on the foam carved tank. After it started to dry, hundreds of 3/8 inch bubbles formed on the surface of the body filler. Normal? Should I wait and just sand them down? Never put body filler on foam before... actually... before this, I never did anything with foam. Advice?

Markie

Offline Markie-V

  • Posts: 89
Re: Project xs750 lowrider
« Reply #71 on: Apr 12, 2018, 23:03:39 »
Forging ahead... started putting Bondo on the plug today. Immediately bubbles began to form on the tank.  I waited a while after the test area... still a little skittish after Tuesday's tank fiasco.  But the only way to make progress is to soldier on. So... fingers crossed for a good day tomorrow.  A lot of sanding. Good day!!
« Last Edit: Apr 12, 2018, 23:05:45 by Markie-V »

Offline doc_rot

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Re: Project xs750 lowrider
« Reply #72 on: Apr 13, 2018, 04:35:12 »
That pink extruded foam is melted by anything with solvents in it. Bondo will melt it a bit, hence the bubbles. Ideally the foam is sealed before hand to prevent the bondo and paint from melting it. Since you are just needing a plug you might be able to forge ahead, but where there are bubbles there are cavities underneath. The green "florists foam" is the way to go. it is not as readily effected by solvents.

Offline pacomotorstuff

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Re: Project xs750 lowrider
« Reply #73 on: Apr 13, 2018, 08:01:24 »
... or seal the styrofoam with a couple of coats of epoxy first.  Then you can use polyester fillers for final profiling.  Doesn't have to be a great bond - you only want the master's profile to last long enough to make your mould.
... and you're going to use mould release wax (4 to 6 applications) and then PVA on the master before making your mould, right?
I had some CNC'ed prototype tooling machined out of white styrofoam in error by a supplier, sealed them with epoxy, used wax and PVA and worked well enough for a couple of parts.
DTT should start a composites thread - a lot of good info from everyone on the above posts.
Pat

Offline d9canada

  • Posts: 46
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Re: Project xs750 lowrider
« Reply #74 on: Apr 13, 2018, 10:06:12 »
I should have thought of this before, sorry, but you could use "Spackle" (sp?) the drywall patching material instead of bondo, build it up, sand it.  It won't attack the styrofoam and you can get a great finish on it.  Then you can paint that.  It's way cheaper than using epoxy and I wouldn't bet on that pink stuff accepting epoxy.  With the work we've done with epoxy and foam, we found the blue stuff worked OK but I think the white stuff melted.  That was years back, sorry at the time I didn't keep notes on that.  Sorry Markie, I should have at least suggested that you do a test patch. 
Brian
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Offline d9canada

  • Posts: 46
  • Just keep pluggin' every day and it'll get done!
Re: Project xs750 lowrider
« Reply #75 on: Apr 13, 2018, 10:16:15 »
Darn!  I should have thought this might happen.  Another thing you could do in future, and again, do a test piece first, but I think you could just paint the raw styrofoam with cheap latex paint and let that set up, then you could use Spackle or even Bondo.  The latex should seal the styrofoam enough to prevent the bondo chemistry from intruding, but a test would tell you for sure.
Brian
63 C105T
73 CB350F X2
77 CB400F X2
73 CB500 X2
77 CB550K X3
80 CB650
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Sandcast CB750 #1003245
71, 73 CB750K X5 (help me!)
78 CB750F X2
82 GL500
82 GL500 Interstate
83 CX650 Euro version
81 CB750C
80-82 CB900C X5 one with Motorvation FII sidecar
75 & 77 GL1000
82 CBX
83 Honda 750 Shadow
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Offline Maritime

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Re: Project xs750 lowrider
« Reply #76 on: Apr 13, 2018, 10:26:31 »
Good old Elmers white glue slightly watered down will seal foam to prevent solvent damage, Modge Podge will as well. I use that for making cosplay props, a couple coats then you can spray paint the foam without it eating into it.
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
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Offline Maritime

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Re: Project xs750 lowrider
« Reply #77 on: Apr 13, 2018, 10:27:31 »
This time however I would sand the bondo, then use drywall mud to fill the small pin holes that will show up then you can sand and paint and likely be fine.
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson

Online Hurco550

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Re: Project xs750 lowrider
« Reply #78 on: Apr 13, 2018, 10:34:06 »
I remember making a class project out of Styrofoam. It was a pretty complex model of a steam engine, and the "main body" was Styrofoam with bits hot glued to it. I was done, less the paint. One coat of black spray paint, and I got an un wanted lesson in chemistry....
"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
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Offline Markie-V

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Re: Project xs750 lowrider
« Reply #79 on: Apr 13, 2018, 13:52:05 »
All is well guys.... I forged ahead with the bondo and even though bubbles appeared on the test area, it was pretty much held in check when I put it on a little thicker. Since I am using bondo to build up and round out the sides anyway,  the bubbles were small enough that they sanded out on the first coat  and were non-existent on the second coat. Any recommendations on an epoxy product to cover the plug after the bondo is done?  "Plugging" away... LOL!
« Last Edit: Apr 13, 2018, 18:12:12 by Markie-V »