The bad news is the welds are rusting in the areas you can not see also ,,a proper job requires removal of manifold,,rust removal ,, then paint..Or if you do not want to remove manifold ,, apply as well as you can some rust remover with a brush ,,clean and paint
If just the exhaust pipes you may be able to do this with out removal
Rust rermovers like naval jelly work well here,, especially in areas that are difficult to reach for a wire brush or wire wheel
Use naval jelly first,,brush it on... wait then clean .... then sand or wire brush as well as you can
On muffler pipes or other parts you do not want to remove ,,when you spray an area you can not see,,mold an old cereal to the shape(round here) and affix it or hold it just above the part being painted ,more paint will get onto the object being painted ,,Tho I prefer to use a brush if at all possible
[This message has been edited by uhlanstan (edited 11-02-2008).]
