G_Body_Man
G_Body_Man Reader
12/2/14 3:55 p.m.

So I'm in the process of restoring my Oldsmoboat, and I need to bog the fender. I am going to install a metal patch, but I need to bondo it to get it to conform to the lines of the fender. It's below zero outside. What temperature does bondo hair cure at?

noddaz
noddaz Dork
12/2/14 3:58 p.m.

Should say on the can what it needs... But it sure needs more than below zero...

And on the Bondo site...

Bondo said: FREQUENTLY ASKED QUESTIONS (FAQ) What is the lowest temperature that body fillers can be used in? 45° - 50°F (7° - 10°C); if using below 65° F, the amount of hardener used should be slightly increased.
Toyman01
Toyman01 UltimaDork
12/2/14 4:07 p.m.

Bondo says 45-50 degrees.

I would also suggest using Straightline. It's a much better product IMHO.

bigev007
bigev007 Reader
12/2/14 4:36 p.m.

Fiberglass resin takes forever to cure in the cold. I would take a hairdryer to it for a good 30 to an hour at those temps.

44Dwarf
44Dwarf UltraDork
12/2/14 4:52 p.m.

problem with using more hardener is it will bleed out in warm weather and stain the paint or make it lift. Take the fender off and bring it in to the basement. warm it up with a 500w halogen light from the back side for 20 minutes or so before applying the bondo.

DeadSkunk
DeadSkunk SuperDork
12/2/14 4:54 p.m.
G_Body_Man wrote: So I'm in the process of restoring my Oldsmoboat, and I need to bog the fender. I am going to install a metal patch, but I need to bondo it to get it to conform to the lines of the fender. It's below zero outside. What temperature does bondo hair cure at?

It's "below zero" Celsius, right?

aircooled
aircooled UltimaDork
12/2/14 5:07 p.m.

As noted. If you are talking about actual Bondo

The competing (more expensive) versions are MUCH nicer to work with. They setup quicker, sand MUCH easier, and flatten better.

I use Evercoat Rage and it is FAR superior.

TeamEvil
TeamEvil HalfDork
12/2/14 5:50 p.m.

Use a fiberglass short strand reinforced resin first. Fill and shape it (when cured) with a coarse rasp. Only use the "bondo-style" filler as a super thin top coat.

Sand most of it off, primer/filler, primer sealer, then paint.

VERY easily done and usually looks pretty good in the end. Temp ought be above 40 degrees.

Nick_Comstock
Nick_Comstock PowerDork
12/2/14 11:25 p.m.

I can +1 the Evercoat Rage, good stuff.

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