Just finished scraping the old bubbled rockergarding off my floor pan. The rusted areas are behind the passenger side wheelwell and moderate rust allong the rear wall from tailight to tailight (approx. 1/3 of pan area). The rest of the pan is in very good condition and is what appears to be the original black glossy primer which still has great adhesion. I would hate to try remove it. My ?. Since POR 15 adhears best to seasoned sufaces, should I only coat the rusted areas and use something else on the rest and topcoat the POR. Will a regular paint adhere better or is POR multi- applicational. Will a chemical etcher help on the glossy primer. My concern is endurence, not stock. Hope you can help.

<BLOCKQUOTE>quote:</font><HR>Since POR 15 adhears best to seasoned sufaces, should I only coat the rusted areas and use something else on the rest and topcoat the POR.<HR></BLOCKQUOTE>

I'd scuff the painted areas and hit it with POR while you are getting the rusty areas.

<BLOCKQUOTE>quote:</font><HR>Will a regular paint adhere better or is POR multi- applicational.[/uote]

I srayed a topcoat (rattle can) while the POR was still tacky. Holds up ok, but there is a POR chassis black made for covering POR when wet or cured.

[quote]Wlll a chemical etcher help on the glossy primer. My concern is endurence, not stock. Hope you can help. <HR></BLOCKQUOTE>

About the only mistake I made when I did my trunk with POR, is that the areas that were rusty were also greasy. I should have degreased it with the POR degreaser. In those areas I picked up some bubbles/fish eyes.

I plan to topcoat with "BIRD EGG" paint later so not a big deal. I was going for endurance too, and after 1 year it still looks great.

I even hit a section of fender I removed and left out all winter. It still looks good.

Long story short, remove all loose rust, degrease greasy areas, scuff painted areas, cover with POR, either top coat while tacky, or use POR topcoat wet or dry.

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Springfield, Ohio

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OOPS!! Don't do that again. You may have got away with one, but you never spray anything on Por while it's tacky. You don't even apply a second coat of Por until the first coat is dry to the touch, which can be anywhere from four hours to overnight, depending on who you talk to. The regional sales rep told me not to recoat until the next day and that's worked out great so far. If you have to paint over Por 15, wait till it's dry and use Por's tie-coat primer. Then you can spray any type of paint you want.
I always add a a few drops of fisheye eliminator when I use Por. It seems to cut down on the fish eye problems that seem to be common with Por 15 and related products.

As to the original question, you're on the right track. Treat the rusted areas with Por, scuff sand the rest of the pan, apply tie-coat primer to the Por painted areas, and then topcoat the entire pan with a good quality epoxy paint.

Just to clear up a few points, we topcoat POR-15 in the tacky stage all of the time. The trick here is to dust a coat of primer, or color coat on the POR-15 when you feel a drag (not sticky). This will give you a chemical bond to the POR-15. Once both coats are completely dry, apply the cover coat.

When topcoating POR-15 with any of our other coatings, let the original coat dry completely. Any of the POR-15 products will adhere to each other perfectly. The Tie-Coat Primer is a great product, and gives you the advantage of letting the POR-15 dry completely before priming, and any conventional paint will then stick to the Tie-Coat Primer.

I have some really strong reservations about leaving the old paint in some areas. Just a perfectionist I guess, but I feel that if there is a problem in some areas, there may be something starting in others. We remove the paint completely with RemovAll Paint Stripper, clean with Marine Clean, prep with Metal Ready, then coat the entire trunk with POR-15. Depending on the level of correctness you desire, you can either topcoat with conventional paints, or leave the POR-15 as is and lay down your trunk mat. If you are worried about proper protection, I suggest that you do the entire area.

Glenn www.por15cr.com (http://www.por15cr.com)