Yes, you can disable columns by specific page types...
Look in:-
includes/templates/template_default/common/tpl_main_page.php
and FTP a COPY of tpl_main_page.php to your hard drive.
open it to EDIT using a proper text editor such as notepad++ or Crimson Editor.
Find the section (around line 41):-
PHP Code:
// the following IF statement can be duplicated/modified as needed to set additional flags
if (in_array($current_page_base,explode(",",'list_pages_to_skip_all_right_sideboxes_on_here,separated_by_commas,and_no_spaces')) ) {
$flag_disable_right = true;
}
And then list the page types you want NO right column to show, in your case, product_info:-
PHP Code:
// the following IF statement can be duplicated/modified as needed to set additional flags
if (in_array($current_page_base,explode(",",'product_info')) ) {
$flag_disable_right = true;
}
Then SAVE the file.
FTP it back to your CUSTOM (over-rides) template folder...
includes/templates/YOUR_CUSTOM_TEMPLATE/common/tpl_main_page.php
(if you don't have a /common/ folder in your custom template tree, create it, then ftp tpl_main_page.php to that folder.)
Look at the logic of the php line above to see how you could do the same for the LEFT column if so desired.