Re: How to paint inside portion of rectangular tube?

Hmmmm .... I'm just DIY but when I work on square tubes I don't do any anything on the insides. Just the outside metal conditioning, priming and painting. However when I weld tubes I always make sure that all is fully welded and no holes for air or water to enter.

We do have some contractors here in the forum. I hope we get some professional insights as I too am interested to know more about this.

Re: How to paint inside portion of rectangular tube?

Hi there highdefinition,

I would like to share some suggestions that can be useful for your inquiry. First of all I am not a contractor here but just an ordinary DIYer like bro Jay who does work with pipe tubings and square or rectangular pipes and also into welding/metalworking from time to time.

Like what you have said you will be using some rectangular or square tubings at about 2m in length for your garage gate, I say square tubings because of the measurements you indicated. I do say its kinda narrow to be painting the insides of these tubings but I guess your primary purpose is to prevent rust build up inside and affect the exterior in the long run, right bro. I was thinking first that not all these tubings will have the same length for your gate, I presume some will be cut shorter than others and some possibly the mainframe into 2m. I think it can be done and here's how.

(1st.) Using your epoxy metal primer, see if you can dilute it a bit more and then stir it well. Pour in a small amount in a small can then set aside, and for your tubings, tilt one end of the tubing to about 3ft or 4ft by holding the tubing and then start pouring the primer paint inside and while the paint travels down inside the tube, you rock it slightly from left to right, do not overturn it, just let the paint travel down wards until all the paint comes out from the other end, but make sure that other end has a pan that will catch the excess paint. And then you can do the same on the next surface until all the inside surfaces has been applied with the primer and likewise with the rest of the metal tubings you are going to use then just let dry overnight.

(2nd.) Another possible way is to tie a piece of rug on a tip of a stick, long enough that it will reach more that 1m and will fit the insides of the tubings, with the piece of rug in place, dip the rug in the paint can then insert it inside the tubing twisting the stick and moving it back and forth, this way you will be able to spread the paint on all surface of the inside of the tubing.

These two possible means can be kinda messy a little bit but I think will be effective but if you think that it will not work for you then just discard them suggestions, okidoki !!! :rolleyes:

Hope this helps bro. 😉 :p 🙂