Polyester Bondo on epoxy fiberglass?

Toxx · Sep 2, 2012

A basic question:

My Fiberglas resin is based on epoxy, will it work to cover it with bondo based on polyester?

Stormy320 · Sep 2, 2012

Yes

I am currently working on a project like this and had no issues.

STEALTH · Sep 2, 2012

yes, I use bondo over epoxy based resin all the time.

Toxx · Sep 2, 2012

STEALTH said:
yes, I use bondo over epoxy based resin all the time.

Do you sand the epoxy coat before applying the bondo?

STEALTH · Sep 2, 2012

Toxx said:
Do you sand the epoxy coat before applying the bondo?

yeah, I use it on pep. I do it mostly to get the polygonal edges rounded and of course it helps the adhesion of the filler.

If anything, a light scuffing is enough for it to stick.

Toxx · Sep 3, 2012

STEALTH said:
yeah, I use it on pep. I do it mostly to get the polygonal edges rounded and of course it helps the adhesion of the filler.

If anything, a light scuffing is enough for it to stick.

Ok, i will see.

Have to wait my epoxy to be cured, need about 24h, but is still a little bit sticky, maybe to much hardener?...

think i should go next time with polyester-resin.

In your videos you are using smooth-on 321, isn't it a PU-Resin?

oysteinhole · Sep 3, 2012

Remember that polyester gasses for a long time after it has cured ... dont paint before a week

Toxx · Sep 3, 2012

oysteinhole said:
Remember that polyester gasses for a long time after it has cured ... dont paint before a week

Bondo (polyester-filler) can be painted when cured....

Do you mean epoxy that gasses?

STEALTH · Sep 3, 2012

Toxx said:
Ok, i will see.

Have to wait my epoxy to be cured, need about 24h, but is still a little bit sticky, maybe to much hardener?...

think i should go next time with polyester-resin.

In your videos you are using smooth-on 321, isn't it a PU-Resin?

yeah, but I prefer expoxamite laminating Epoxy Resin now adays. I have a video for that as well.

Toxx · Sep 4, 2012

STEALTH said:
yeah, but I prefer expoxamite laminating Epoxy Resin now adays. I have a video for that as well.

Think you also live in an area with cold climate conditions where it is unconfortable at an "well aerated area" in winter. :love

Do you use a mouse sander or something for your scuff sanding after epoxy?

Darth Lars · Sep 4, 2012

Epoxy is sometimes used as a primer on materials that can't stand polyester. For instance, many surfboards are made from a styrofoam core with a layer of epoxy and then covered with polyester-resin and fibreglass.

Toxx · Sep 4, 2012

Darth Lars said:
Epoxy is sometimes used as a primer on materials that can't stand polyester. For instance, many surfboards are made from a styrofoam core with a layer of epoxy and then covered with polyester-resin and fibreglass.

Ok, the epoxy looks really Sleek and glazed so is think I will sand it a little bit

Polyester Bondo on epoxy fiberglass?

Toxx

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