Knock down the excess putty with 80-grit sandpaper and a rubber sanding block. Then switch to 240-grit. To fix gouges and deep scratches, you'll need “chop” (powdered fiberglass) filler, gel coat and gel coat reducer..
Furthermore, how do you get scratches out of a boat hull?
Start by removing the wax and grease from the area with acetone. Wet sand the area with 1000 grit wet/dry sandpaper. Use a pail of water and gently rub the area with wet sandpaper. Frequently re-wet the paper to remove the gel-coat dust (paste) from the work area.
Furthermore, how do you repair scratches in fiberglass? Apply a small amount of polishing compound to a soft cloth if the petroleum jelly fails to remove the scratch. Rub the compound into the scratch in a circular motion. Rub your finger over the scratch to assess your progress. Repeat this process several times, or until the scratch disappears.
One may also ask, how do you fix scratched gelcoat?
When the new gelcoat is flush, put 220-grit wet-or-dry paper on your block and wet sand the repair, this time with your block flat. Use a circular motion and keep a trickle of water running on the sanding area. Feather the repair into the old gelcoat until your fingertips cannot detect a ridge.
How do you touch up paint on a boat?
Remove all loose paint, then sand the hard edges where the sound paint remains using 220-grit sandpaper; sand so there's a gradual transition between paint and bare metal. Next, clean the surface with solvent (avoid touching it after) and mask the area (the tape should bisect the area on the existing, sanded paint).
Related Question Answers
What is gelcoat on a boat?
Simply stated, gelcoat is the outermost structural layer on a fiberglass boat hull, designed to protect the underlying fiberglass layers. It is usually pigmented to match the hull color and is available as both a resin and a thicker, putty form, called paste.How do you remove scuff marks from a dock?
I like magic eraser, but I also use the scouring side of a yellow/green kitchen sponge. The abrasive side takes scuffs right out of the finish. Acetone will take them right off, as well as the wax. After wiping the dock rash away with acetone, go back over the area with a good coat of wax.How much does it cost to repair scratched gel coat?
It's about 5 hours of labor, mostly waiting for stuff to dry. I'd estimate it's about $800 to fix. If you are interested in learning to do Gel-Coat repair, those scratches are definitely fixable with Spectrum Gel-paste and a can of Gel-coat.How do you touch up gelcoat on a boat?
Wet-sand the cured gelcoat with 320-grit wet/dry paper on a soft sanding block. Confining work to the immediate repair area, continue wet-sanding with 600-grit paper until nearly even with surrounding gelcoat. Finish wet-sanding with 1,000-grit paper; then buff out with rubbing compound followed by a coat of wax.Can you buff scratches out of fiberglass?
Scratches that don't penetrate down into the layers of fiberglass often can be wet-sanded flat and buffed back to a shine with no need for gelcoat at all. Miro recommends starting out by dry-sanding with 180-grit sandpaper. When you begin to see the scratch disappear, bump up to 320 grit.How much does it cost to gelcoat a boat?
In general, most repair yards estimate the job by the foot, so the estimate for painting the hullsides from the waterline to the gunwale with the gelcoat in good shape and maybe some minor crazing might be around $300 to $500 per foot from start to finish.How do you fix deep gouges in gelcoat?
Begin by sanding around the area and the scratch with 320-grit paper. Again, be cautious not to remove too much material. After sanding, use a Dremel tool to clean out the gouge a bit, then feather the edges of the scratch with 180-grit. This helps the gelcoat blend in and helps hide the edges of the filled scratch.How do I restore the color on my fiberglass boat?
Use a soft cloth to apply polish to a small area at a time, rubbing with a circular motion until the surface becomes glassy. After polishing, you should apply a coat of wax to protect the surface and improve the gloss. Some polish products include wax in their formulations.What to use to fill holes in fiberglass?
The reinforcement could be a layer or two of fiberglass cloth with epoxy, a thin layer of cured fiberglass laminate like G-10, or a ½” thick piece of plywood sealed with epoxy. When the epoxy used in your reinforcement has gelled, use epoxy thickened with 403, 404, or 406 filler to fill the hole.How do you repair Fibreglass Hull?
To patch the hole, buy a quart-size polyester resin fiberglass repair kit at a marine store; from the boat's manufacturer, buy gel coat to match the color of your boat. If you can't find a repair Kit buy 1 quart of polyester resin and hardener, and 2 square feet each of 10-ounce roving and 7 1/2-ounce fiberglass cloth.How do you repair a scratched bathtub?
Remove scratches on a porcelain tub with a Mr. Clean Magic Eraser. Wet the magic eraser with warm water and rub over scratches. Apply a small amount of pressure over scratches, rubbing in a circular motion until scratches are gone.How do I fix a scratch in my sink?
In cases where the scratches are relatively minor, baking soda can be used to remove annoying porcelain sink scratches. Simply sprinkle baking soda over the length of the scratch, or cover the entire nick with a hefty dose of baking soda. From there, buff the scratches and nicks with a soft, damp cloth.How do you repair scratches in a fiberglass tub?
Fill deep cracks with the filler included in your repair kit. Use a small rubber scraper to apply the filler and smooth it down so that it is flush with the surface of the tub. Allow the filler dry for at least 30 to 45 minutes. Give it extra time to dry if the day is damp or rainy.Can you use magic eraser on fiberglass boat?
Dirt can get toughly embedded into the diamond plate and tread bump areas too. It's not easy or quick to clean. But what I have found best to work in these areas, as well as cleaning your boat seats, is Magic Eraser. It's not just mildew and mold it helps with, but also other dirt.Is acetone safe to use on fiberglass?
Acetone and paint thinner should only be used for stains such as oil or paint. Since these materials can harm the fiberglass, only use them to tackle especially bad stains. Spot clean using acetone and paint thinner, so you don't damage any areas not heavily stained.How do you get stains out of gelcoat?
To remove a gelcoat stain, begin by washing the affected area with soap and water. This alone will remove many stains, provided they are water-soluble. However, attempting to remove a mineral stain with soap and water is a waste of time, because these stains are not water-soluble.How do I remove dock rash from gelcoat?
Best way is wax with cleaner in it. Deeper scuffs will take more elbow grease. Acetone takes them off quickly but will also remove some of your gel coat and you will have to re wax the area. So the best bet is to use a product like 3M Cleaner Wax or Restorer Wax which has a mild compound in it. 
