Hide admin bar on certain post type

I’ve got a custom post type – ID productpopup– which I want to hide the admin bar for all users including admin. The theory behind my function is as follows:

The post type is selected using

get_post_type( $post ) == 'productpopup'

And then the Admin Bar is hidden using

add_filter( 'show_admin_bar', '__return_false' );

So putting the following in my themes functions.php in my mind should work, but it doesn’t

if ( get_post_type( $post ) == 'productpopup' )
add_filter( 'show_admin_bar', '__return_false' );

WordPress 4.3.1

Solutions Collecting From Web of "Hide admin bar on certain post type"

Don’t hack your WordPress core. It’s overriden after every upgrade (plugins do exist for some reason).

You can solve your problem in this way:

1) Open your single.php.
2) Define

<?php 
function hideAdminBar ($post_id)
{
    if (get_post_type ($post_id) == 'post')
    {
        add_filter ('show_admin_bar', '__return_false');

        /* For removing the top blank space. */
        echo '<style type="text/css" media="screen">
            html { margin-top: 0px !important; }
            * html body { margin-top: 0px !important; }
            </style>';
    }
} 
?> 

3) Inside The Loop, call this function right after the while condition. Like this:

<?php while ( have_posts() ) : the_post();?>

    <?php hideAdminBar (get_the_ID ()); ?>
    /* etc. */

<?php endwhile; ?>

Hope this solves your issue.