Anyone able to help? Still not fixed

Hi Earl, yeah there is no coating on these coasters.
Found a video online that says it might be due to moisture and using tefal as cover sheet? Advises to use butcher paper instead to absorb it?

Not tried it yet though

<t>Going out my mind trying to get this right. <br/>
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So every time I press a coaster it has bubbles? In it.<br/>
I've kind of tried everything now.<br/>
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Any suggestions?<br/>
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I'm pretty new to all this!<br/>
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Here's a photo.<br/>
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Image should be solid background colour ...