I'm finishing a Mirv, and I am wondering what people have used to prime the foam. Preferably something rattle can. I usually use auto primer on everything else, I know that is a no-no for the foam. Something with good build properties would be ideal, since that should help with irregularities in the foam. Thanks.

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All you have to do is initiate and propagate a combustive reaction between kerosene and oxygen and direct the resultant gasses through a small aperture in a nozzle at supersonic speed without blowing the whole thing up. It's not rocket science!

I am guessing that you are getting rid of the ejector marks on the foam parts? Find a water based clear coat. It used to be thinned white or PVA glue in the early days of foamies, but the best primer is the foam skin for an acryl paint.

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"The complexity of living is eminently favored to the simplicity of not."

John isn't wrong, but personally I use Testors rattle-can primer white primer and gray primer. It's foam safe. I painted the nose cone of this Quest MLAS with it.

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That sounds like what I'm after - thanks. And that's a nice looking rocket. Almost as many fins as mine!

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All you have to do is initiate and propagate a combustive reaction between kerosene and oxygen and direct the resultant gasses through a small aperture in a nozzle at supersonic speed without blowing the whole thing up. It's not rocket science!

Thanks! It has more fins than a Helsinki phone book. i

__________________
Never trust an atom. They make up everything.

4 out of 3 people struggle with math.

Chemically, alcohol IS a solution.

NAR# 94042
SAM# 0078

That was good. Despite it being corny as heck, I'm enjoying a good chuckle

Doug

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The kind that won't melt foam...

Later! OL JR

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Kilz brand white primer in the rattle-can is foam-safe and fills very well. Dries slowly though. Spray on evening then sand the next.

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GH, after shooting the Kilz primer can a non foam-safe topcoat be used?

__________________
Never trust an atom. They make up everything.

4 out of 3 people struggle with math.

Chemically, alcohol IS a solution.

NAR# 94042
SAM# 0078

I knew I'd done one of those--I just had to find the photos.

As I remember, there weren't enough re/white target decals to finish the rocket as shown on the packaging, so I made more of them with red and white adhesive film and an OLFA cutter. I also remember that the foam would dent if you just looked at it wrong.

Here's the MIRV I built back in 2012.

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__________________
Never trust an atom. They make up everything.

4 out of 3 people struggle with math.

Chemically, alcohol IS a solution.

NAR# 94042
SAM# 0078