WordPress: Paginando 2a. query dentro de tpl page/single

<?php
/*
paginação de segunda query, dentro de qualquer template page.
*/

if (isset($_GET['pg'])) $cur_page = absint($_GET['pg']);
else $cur_page = 1;

$args = array( 'post_type' => 'product', 'posts_per_page' => 5, 'paged' => $cur_page );

$wp_query = new WP_Query($args);

while ( $wp_query->have_posts() ) : $wp_query->the_post();

    echo '<h2>' . get_the_title() . '</h2>';

    echo get_the_content(); //ou get_the_excerpt()

endwhile;


$page_links_total =  $wp_query->max_num_pages;
$page_links = paginate_links( array(
          'base' => add_query_arg( 'pg', '%#%' ),  //pg é a variavel que vai aparecer na url ?pg=1 ....
          'format' => '',
          'prev_text' => __('&laquo;'),
          'next_text' => __('&raquo;'),
          'total' => $page_links_total,
          'current' => $cur_page
        ));

if ( $page_links ) echo '<div class="paging">'. $page_links .'</div>';

wp_reset_query();

?>