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Faulty processing when use Boolean function add

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I have made a somewhat complicated shape in Affinity Designer on the iPad in black.

i did Expand stroke on the thin black lines I made.

I want to use the contour tool on it so I can have multiple outlines.

To be able to use that I need all the shapes to be 1 compound.

So first I ungrouped all the items, than I select all and I select ADD at the Boolean functions. But I get very unexpected results.

How can I fix this? So in the end the green will be one shape with an outline behind the black thin lines?

I hope anybody can help me with this.





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Hi JanRautz,

Welcome to the forums :)

Rather then using Boolean Add does Merge curves from the edit menu give better results?



Please tag me using @ in your reply so I can be sure to respond ASAP.

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Hello Callum,


Thank you for your time!

‘Merge curves’ does give a lot better result as you can see in the process video.

only one part the lines are double as you can see on the picture.

i don’t know why because it’s an exact copy of the lower part of the artwork.

Since the lower part turned out good I split the curves and copied the lower part and joined the lines again.

So unfortunately still had quite some work to fix it, but it worked and now I am able to use the appearance panel and give the lines multiple outlines.

no need to use the contour tool in this case.

Any other tips for me how I can do this easer on the next project?



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  • 2 weeks later...

Just want to add to this topic instead of creating a new one.

Boolean problems are have been around for a long time. I mostly use Divide and Add operations. Both are not working as intended. Divide creates many small fractions especially with curved objects.

Booleans are very frequently used for creating objects. Have another look into it's development progress, please.

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