Paint Baking in oven

[Brendan GillParticipant @brendangill16097]

Hi all

I am just painting the bass cleading on my boiler. I have notice in passing at various places over the internet people have mentioned "Baking the paint on" in an domestic oven.

I assume this helps bond the paint to the metal better? Quicker?

Does anyone here do it? for how long do you bake the paint? how hot? is it worth it? I have tried googling this but not found any answers.

Brendan

[Brendan GillParticipant @brendangill16097]

[not done it yetParticipant @notdoneityet]

I assume this helps bond the paint to the metal better? Quicker?

By all means assume it dries/cures the paint much quicker, but apart from that I wouldn’t assume anything else.

[Mike HurleyParticipant @mikehurley60381]

There's an article here that may be useful

Baking paint

regards Mike

[David NobleParticipant @davidnoble71990]

Certainly quicker but I have a couple of caveats :-

Don't have the oven too hot and, probably more important,

beware of upsetting the lady of the house as the smell is 'interesting'.

David

[Simon Williams 3Participant @simonwilliams3]

Is this a hang-over from the days of stove enamel, which, without a baking process, wouldn't reach its potential performance in terms of chip resistance and durability. My recollection is that they needed a short spell at 150 – 200C after initial air drying. Modern car finishing systems appear to often involve cookery.

Cooking modern coach enamel paints (polyurethane or alkyd resin based, i.e. air drying) will tend to soften them, even at fairly moderate temperatures.

Two pack epoxy or cyano-acrylate paints are hardened chemically, and set more expeditiously at an elevated room temperature. Not sure I want to put figures against the permissible limits of this, it depends on too many other factors.

What sort of "paint" are we dealing with?

edited for typo

Edited By Simon Williams 3 on 01/10/2023 10:37:03

[Brendan GillParticipant @brendangill16097]

Thanks everyone..
I am usingetch primer and enamel paint followed by a clear laquer.

I dont think I am going to oven bake it besides the heat of the boiler will do a good job anyway.

But this was worth a good discussion.

[Oven ManParticipant @ovenman]

Be very careful with baking paint containing volatile solvents. Even when it appears dry it can release sufficient vapours to cause spectacular explosions. With domestic ovens the elements are very often running at temperatures well above the auto ignition temperature of the solvent. We scared the living daylights out of our senior management when an oven let go in the test lab underneath their boardroom. You need to a good flow of air through an oven to ensure solvent vapours are no more than one quarter ot the lower explosive limit of the solvent in question. Paint drying ovens are quite complex beasts to ensure they are as safe as possible.

Peter

[CHAS LIPSCOMBEParticipant @chaslipscombe64795]

The question of using an oven or not probably relates to "stoving enamels" versus "air drying enamels" rather than to any of the more recent paint systems. The more modern systems (acrylics,polyurethanes etc etc) may or may not require stoving depending on their exact chemical composition.Usually the temperature required is significantly lower than that used for stoving enamels.

The common-or-garden enamels that have been around for years can require air drying or stoving depending again on their chemical composition. The obvious thing to do is to read the label to see which you have.

It is not technically possible to force-dry an air drying enamel in an oven and reach the higher performance of a stoving grade enamel.A stoving enamel will not air dry, no matter how long it is left to dry.

Similarly the performance charachteristics of a stoving enamal depend on the time and temperature of the stoving stage – again read the label on the tin!

[Dave HalfordParticipant @davehalford22513]

Posted by Mike Hurley on 01/10/2023 10:33:48:

There's an article here that may be useful

Baking paint

regards Mike

Mikes link appears to be written by early doors AI for Amazon, in places it sounds like a bad interpreter .

• Add water to thin paint
• don't bake paint on steel, but alloy is OK
• Generally, it would help if you only baked paint for small projects to put the painted object inside the oven.

Does anyone know of a water based high temp paint?

You were supposed to bake Sperex for exhaust manifolds to cure it back in the day.

As far as faster goes If you apply heat to wet paint there's a chance you will seal solvents under a hard skin, which will blow the coating off as the trapped solvents expand

[Andrew TinsleyParticipant @andrewtinsley63637]

Any idea where you can buy stoving enamel these days? Googling seems to throw up powder coating. I am not a fan of the latter and would love to use stoving enamel as I once did.

Andrew.

[Andrew TinsleyParticipant @andrewtinsley63637]

Any idea where you can buy stoving enamel these days? Googling seems to throw up powder coating. I am not a fan of the latter and would love to use stoving enamel as I once did.

Andrew.

[bernard towersParticipant @bernardtowers37738]

When I used to do my m/cycle paint I used Joseph Mason E100 enamel and left it to dry for about 6 hrs then put the bits in the oven at less than 100degc for a short period of time. Not sure if it really made any difference but it was very hard to chip or scratch.

[Brendan GillParticipant @brendangill16097]

you can buy stoving enamel here.

Paragon Paints https://www.paragonpaints.co.uk/paragon-black-stoving-enamel-semi-gloss.html

 

Brendan

Edited By Brendan Gill on 02/10/2023 10:49:37

[StueeeeParticipant @stueeee]

I’ve baked lots of smaller components in the oil fired kitchen range here. I only do this for enamel paints which although they air dry, will take many days (or even weeks in winter weather) to fully harden.

As noted previously, too high a temperature is likely to cause blistering as the solvent can’t escape the drying surface of the enamel quickly enough. Our range has a pressure jet burner, rather than the AGA ‘always on’ wick burner, so there is a degree of temperature control. I set the oven at 70 degrees C. after a few hours and once the item has cooled, the paint will be fully hard such that it won’t tear or mark when fasteners are tightened up against the surface.

Also as noted previously, it’s important that your wife/partner/significant other is out of the house when you’re doing this.

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