POR 20 preparation

[54Illinois]

The motor I bought has already been painted. Let us assume the mechanic used a engine grade paint, for the heat. Can POR 20 be applied right over the paint? The manifolds are brushed clean of paint and rust, so the POR 20 is going directly onto them.

Edited January 6, 2012 by 54Illinois

[pflaming]

ACE HRD has a product "Jasco Prep and Prime" which is the same product as POR and at 1/4 the price.

[BobT-47P15]

I would try painting over some of the current paint to see if anything

happens, like bubbling or such. If all seems to hold, it will probably

work OK.

[Frank Elder]

What happened to por-15? Did it get reformulated?

[Big_John]

POR-20 is their hi temp paint for exhaust manifolds. I don't believe it's intended as an engine enamel.

http://www.por15.com/Data%20Sheets/high%20temp%20directions.pdf

With any high temperature paint, it's only as good as what it's painted over.

[Frank Elder]

POR-20 is their hi temp paint for exhaust manifolds. I don't believe it's intended as an engine enamel.

http://www.por15.com/Data%20Sheets/high%20temp%20directions.pdf

With any high temperature paint, it's only as good as what it's painted over.

Thanks:)

[54Illinois]

Well the engine rated paints are up to 500 degrees. The heat from the motor will cure it. Putting it on only the manifold seems a waist since I am only painting one. I saw pics of Bob's motor painted with POR 20 and I like the way it looks.

The big plus is the advertised durability towards the elements.

I guess we will see...

[BobT-47P15]

Looking good.

How a particular brand of style of engine paint performs is a

very subjective matter. I had good luck with the POR product.

Obviously, others have had equally good results from other

brands. None of them will be totally perfect, and the engine

will eventually get dingy and need to be either cleaned or

repainted. So, I figure- use the one that seems best to you

for whatever reason. If it doesn't do the job, you can try

another brand later.

[54Illinois]

Has the paint on your motor cured? I have been told the blocks will not get up to 300 degrees.

[Big_John]

Has the paint on your motor cured? I have been told the blocks will not get up to 300 degrees.

If your block gets up to 300 degrees, you're going to have more problems then the paint looking OK.

This is really the wrong paint (Por-20) to use for your engine block. If you want to use a Por-15 product (although I don't know why) for your engine, look at their engine paint rather then their high temperature paint.

IMHO, the engine paint will last much longer and look better. Use the right stuff for the job.

I personally like the Dupli-Color engine paint myself, but any good high solid paint works well. Here's the last engine I did.