Hey there, I am restarting a project after some considerable delay, and the first thing on the agenda is body work. Most rust has been removed and repaired, though existing damage to quarter needs to be looked at among others. Sandblasting is the treatment Im going for to remove paint and surface rust that has inevitably come up, but currently still unsure as to what post-blast primer is going to go on. Options are: A: POR-15 Local paint shop recommends it...and luckily enough stocks it on the shelf Looks good promising, but I personally have no experience with it. B:Powder coating A place around the corner that does zinc powdering on a whole shell in grey, black or red. Its sprayed in the oven, then baked. Supposedly gives a very hard coat and penetrates the steel and is a good preventative to rust. Almost like what manufacturers do these days. C: Epoxy Primer Ol' trusty, and seems a favourite for those in the industry, so im told. Questions for those in the know: Before blasting, is it worth while doing rust repairs, and metal finishing? Ideally my preference would be to smooth body by hand rather than fill, albeit within reason. If using POR 15 system for the underbody area, does it get used in combination with other systems? What, if any, are the compatibility issues with this? Can it be applied to the whole shell?? Touch ups? Can it be welded over? Opinions on the product? What are its limitations? Powder coating zinc? With this treatment was told repairs are to be done as per norm, then once welded, just touch up with zinc pressure pack. Epoxy. Once set does it get in the way of the bonding of metal wiping? Is it weld through or are there other products for that? Is it a reliable rust barrier/preventative? If not, what can be applied over as a preventative for areas such as rockers, wheel wells, gutters, cowls, window frames? etc. And in what sequence ie: blast, primer, protection, topcoat, more protection? Any advice is appreciated, as this is not my my area of expertise. Any alternatives not mentioned? Any procedures that must be followed or things to avoid? Thanks in advance.