Make sure that they are as clean as possible.
How to remove paint from plastic guttering.
Occasionally gutter seams or joints open producing major leaks.
Next scrape the straight edge across the paint continuing until all of the.
Try to get off as much of the old paint as you can.
Oil based paint works very well on plastic and does not require a primer.
It is best to paint the gutters and downspouts with oil based glossy paint.
Apply the paint with a brush and a small 4 to 5 inch roller.
Scratch off old paint on the gutters with the putty knife putting pressure on the knife as you scrape off the paint using long strokes.
Inspect your work as you go for runs and drips.
When the paint starts to wrinkle scrape it off using the plastic putty knife.
This paint does not require a primer and it works well on plastic.
Strip off the old paint with a plastic putty knife.
Knowing how to repair plastic gutter seams early on reduces the chance of further damage and possibly a major repair.
To remove dried paint from plastic start by applying some rubbing alcohol to the paint which will help loosen it so it s easier to scrape off.
After removing a significant amount of the paint on the surface of your plastic pour warm water on a sponge and add some detergent.
Paint the edges with a brush and the majority of the gutter and downspout with the roller.
I would be scared to remove sandtex and black gloss paint from sills by way of heat gun as this can warb the pvc or by using a chemical paint removal stripper which could also damage the pvc i would test area dry scrape the sandtex and key into the black use a pvc paint over with a few coats.
Also use the paint rollers to make the paint job go faster and to provide a smooth finish.
Then hold a straight edge like a paint scraper your fingernail or a flathead screwdriver at an angle against the paint.
Before painting the gutters wash them with warm water.
Repairing the seal in a plastic gutter seam will keep the water from pouring into your woodwork.
Step 5 scrub the area.