Conditional Tags is_product_category

I’m trying to add a button to my single product pages which allows the user to request a sample, however I only need this to be seen on products within certain categories.

I’ve got the button appearing on the single product page, however I want to now single out the categories on which it should only appear.

This is what I’ve got so far, but it doesn’t seem to be working…

<?php if is_product_category( array( 'coving', 'skirting-boards', 'dado-rails', 'indirect-lighting-by-orac' ) ){ ?>
    <div id="requestsample"><a class="fancybox button" href="#contact_form_pop">Request a Sample</a><div class="fancybox-hidden" style="display: none;"><div class="hentry" id="contact_form_pop" style="width: 600px; height: 500px; overflow-x: hidden"><?php echo do_shortcode( '[contact-form-7 id="269" title="Request Sample"]' ); ?></div></div></div>
  <?php} ?>

Can anyone help me out… Am I on the right track?
Any help will be greatly appreciated!!
Thanks in advance!

http://wordpress.org/plugins/woocommerce/