Attempting to sort rusty hatch frame top but starts raining.Should have masked with thin cardboard
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Yes, been there done that!
I had a bit of rust appearing in that gap, but on the roof section. After many tries at fixing it, I finally bit the bullet and removed the hatch.
That of course, allowed me to clean the hatch seam which is virtually unreachable when fitted, and clean, prepare, spray and give a coule of top coats to everything. Did not go OTT with polishing to get a full 'as new' shine' but certainly did prevent the corrosion spreading.
Not too difficult to remove / replace but is a three man job. Two to support and lift / lower, one in the boot to guide it into place without scratching anything. The most time consuming part was gently nudging it left / right / front / back so that it closed easily again.
My only comment on your photo, like you, I used low tack masking tape to hold the newspaper in position, but when I removed it, some clearcoat came along for the ride. It is a b***h trying to get that area looking like it was!