Painting with primer-question

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Northman49
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Painting with primer-question

#1

Post by Northman49 »

If you first coat a fount with primer do you heat/bake it as you do with the final coat(s)?
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arizonacamper
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Re: Painting with primer-question

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Post by arizonacamper »

You can though I personally don't bake it. Of course I have an advantage. in the summertime with it being 95 to 112 degrees out here no real need to bake it. just let sit in the sun for a while. I will give it a little sanding so the paint sticks a little bit better though. just my two cents worth
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Re: Painting with primer-question

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Post by MYN927 »

I wouldn't bake the primer because I don't want it to heat-cure before overcoating with paint.
I'd believe paint adheres better to uncured primer.
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Re: Painting with primer-question

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Post by mksmth »

only paint i bake is the high temps stuff that requires it.
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Ridge Runner
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Re: Painting with primer-question

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Post by Ridge Runner »

MYN927 wrote: Mon Apr 05, 2021 9:50 am I wouldn't bake the primer because I don't want it to heat-cure before overcoating with paint.
I'd believe paint adheres better to uncured primer.
I've read that elsewhere, too.

Also, something about if primer has sat on a surface for too long it should be removed and re-applied before top-coating. I don't know what "too long" is, but imagine it has to do with the cure time of the primer.
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Re: Painting with primer-question

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Post by pagrey »

I think primer can absorb water. If it is hot and dry you can leave it for days. If it is humid hours can ruin it or prevent paint from adhering correctly.
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Re: Painting with primer-question

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Post by curtludwig »

I used to let each coat of primer and paint harden for a day before I went on to the next coat. These days I wait 10 minutes and move on to the next coat. I can have the basic finish ready on a lantern in an hour if I don't screw up the painting.

Then I let everything harden a solid week before I cut and then clearcoat. Then let that harden at least a week before reassembly.
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MYN927
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Re: Painting with primer-question

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Post by MYN927 »

It might not apply to all types of primer or paint.
Usually, the manufacturer's technical datasheet would state both the minimum and maximum recoat times at a specified temperature and humidity.
If the maximum time has been exceeded, they'd recommend sanding and re-application of the paint.
This maximum recoat time usually implies that the paint or primer has cured to some extents. Baking the primer would accelerate curing and reduce the maximum recoating time. Cured paints are pretty hard and impervious and do not allow much diffusion of the overcoat paint. This somehow reduce the level of bonding/adhesion of the subsequent coating on it.
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