Using an acrylic top coat?

uart
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Using an acrylic top coat?

Postby uart » Mon Feb 05, 2018 5:05 pm

I've just been cleaning and touching up a few blemishes on the old Apollo Concorde that I'm (partially) restoring (Will post some photos soon). It's nothing too special believe me, but I was going to put on a light clear coat once I'm finished. I usually use something like White Knight "clear guard", but I've got none left. I've got a spray can of some basic looking "SCA Acrylic clear coat" laying around, it says it can be used on plastic, metal or fibreglass. I wonder if it would be worthwhile giving that a go?

I used to think that the White Knight stuff was something better (costs a lot more), but last time I used it on bare metal the rust just came straight through in a matter of weeks, and I'd cleaned it really well to bare metal (yeah I've since learnt that it really does need the paint underneath). Now I'm wondering if the White knight stuff really is any better than the cheap generic stuff like this SCA one?

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Tim
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Re: Using an acrylic top coat?

Postby Tim » Mon Feb 05, 2018 5:42 pm

Is it an exterior grade clear product?
Reason being that the more expensive exterior quality clear coat finishes have UV stabilising additives.
Cheaper interior clear finishes often go yellow and ultimately break down after exposure to the sun.
Acrylic/water based finishes however are less prone to yellowing than oil and solvent based products.

LG
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Re: Using an acrylic top coat?

Postby LG » Mon Feb 05, 2018 6:26 pm

My very basic understanding is that you can use enamel over acrylic paint, but it doesn't work so well the other way around. Not sure if this helps at all.
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duncan16v
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Re: Using an acrylic top coat?

Postby duncan16v » Mon Feb 05, 2018 6:36 pm

Dulux clear coat two pack is the way to go: https://www.bunnings.com.au/dulux-duram ... t_p1400741

It spays on noice and you should have fewer issues with solvents attacking the existing coating, although test on an inconspicuous spot first.

You should use a respirator if you're going to use it, but at least it doesn't contain isocyanates.

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QuangVuong
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Re: Using an acrylic top coat?

Postby QuangVuong » Mon Feb 05, 2018 8:00 pm

I've used the SCA clear acrylic before. Its a decent clear coat for fresh paint. I haven't used it for spraying over old paint, but as long as you prep the underlying surface you won't have any real issues with it.

As LG stated, an acrylic clear will not really adhere the best to enamel paint. It will dry as a layer of paint on the top rather than chemically bond onto the underlying surface, but since you're spraying onto old paint it won't really make a difference.
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uart
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Re: Using an acrylic top coat?

Postby uart » Mon Feb 05, 2018 8:36 pm

QuangVuong wrote:I've used the SCA clear acrylic before. Its a decent clear coat for fresh paint. I haven't used it for spraying over old paint, but as long as you prep the underlying surface you won't have any real issues with it.

As LG stated, an acrylic clear will not really adhere the best to enamel paint. It will dry as a layer of paint on the top rather than chemically bond onto the underlying surface, but since you're spraying onto old paint it won't really make a difference.


Ok thanks. This is the stuff I've got. http://www.supercheapauto.com.au/Product/SCA-Aerosol-Paint-Acrylic-Clear-400g/288522

This bike is not exactly the Mona Lisa or anything, I just want to try and gloss it up a little bit. Yeah I think I'll give it a go. :)

duncan16v wrote:Dulux clear coat two pack is the way to go: https://www.bunnings.com.au/dulux-duram ... t_p1400741
Wow, two pack in the one can, that's pretty cool. I'll remember that one for next time I'm doing a proper job. ;)

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ldrcycles
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Re: Using an acrylic top coat?

Postby ldrcycles » Mon Feb 05, 2018 10:23 pm

The regular duramax clear coat is also good, I used that over duramax metallic red on a recent project and got a fantastic result. Another good clear is Rustoleum 2X, also available at Bunnings. I used that on my car bonnet as it's supposed to be UV resistant, I'll find out soon enough on that score :-)
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