Metal prep is key for POR....
The guide from Jordan is accurate.
POR prefers a slightly etched surface.
Sandblast tecture is best.
Followed by degreasing allow to dry
Followed by Phosphoric acid spray allow to dry
wipe off the white dust left over from the acid solution.
Watch for fingerprint they will cause fisheyes.... clean rubber cloves are cheap insurance.
Coating POR with self etching and or directly on tacky POR has given me crackled paint..... so I let it cure fully before spraying the self etching.
POR also sells a Tie coat... baby blue... very thick self leveling sandable primer to cover POR..... on pitted frames it works fantastic once cured any top paint will adhere. BUT the tie coat is thick and you will loose some details on smaller parts and I then prefere to use the spray can of self etching primer.
Spray painting with POR is quite feasible even if very dangerous....... I would never do it inside..... there are no face mask that will properly filter the fumes which can harden in your lungs for permanent damage.
Done outside in open air...preferably in a rural area...... no near neighbours, kids or pets is safer. I still use a comprehensive face cartrige filter, stay up wind of any drifting paint, wear old clothes, and wear a grinding face mast over your glasses as you cannot wipe POR driplets from the lens.....ask me how I know.
POR sprayed is very light and can run like crazy..... removing runs requires the part to be sandblasted and even them is it difficult to remove. Best sprayed in light coats or on flat surfaces.
Bolt theads and captive nuts will require cleaning with a tap and die.
If you use paint brushes buy cheap ones and discard.. not worth trying to clean them.
I only use POR supplied reducer and because it is so thin in consistency I hardly need to use any when spraying.
I use cheap gun wash at $35 for a 5 gallons which is a recycled mixture of xylene, tuolene, MEK, eye of a bat. etc which is strong enough to clean the guns..... and gun cleaning has to be done immediately///// if you second coat..... clean the gun first...let the parts get tacky and reset up the gun again.
It is wonderful stuff.... a bit expensive but done right is very permanent.
The gloss is best used on inner sections of CMP rims ...... I to prefer the semigloss and self etching for most jobs.
Just finished reskinning my doors and will be carefully dripping POR around all the inner edges... it will flow into the smallest crevasses to bond and seal..... messy has it will drip on the barn floor but very effective.
If you like to wear a belt and suspender POR is for you.
Done carefully it is safe.
Cheers
PS.... the new shinny door skins will be buffed with 300 grit sand paper to insure the POR will adhere. The inside has already been buffed and painted with POR except for the edges where it will be spot welded........ that is why I will drip POR to seal the edges..... spot welded surface edges were cleaned with acetone prior to spot welding.
__________________
Bob Carriere....B.T.B
C15a Cab 11
Hammond, Ontario
Canada
Last edited by Bob Carriere; 22-02-16 at 19:19.
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