when i used peek on those forks to show how they could come up, at the end i used a jay cloth and water and rubbed in peek into the cloth and a drop more water so it was wet but not dripping wet - then just gentle rub in lines down the tubing
i would test the method on some thing else before you try on the frame - the answer in to go gently
don't know if this helps mate
pm me if you want to call me about it and further details or even coming to see you at work as i need to sort my laptop out in farnham
cheers B